diff --git a/packages/core/src/tracing/instrumentation/cloud/aws-sdk/v3/sqs-consumer.js b/packages/core/src/tracing/instrumentation/cloud/aws-sdk/v3/sqs-consumer.js
index cd29f1aba6..a5ce0781a2 100644
--- a/packages/core/src/tracing/instrumentation/cloud/aws-sdk/v3/sqs-consumer.js
+++ b/packages/core/src/tracing/instrumentation/cloud/aws-sdk/v3/sqs-consumer.js
@@ -24,17 +24,19 @@ function instrument(SQSConsumer) {
           span.disableAutoEnd();
           const res = orig.apply(this, arguments);
 
-          res
-            .then(() => {
-              span.d = Date.now() - span.ts;
-              span.transmitManual();
-            })
-            .catch(err => {
-              span.ec = 1;
-              tracingUtil.setErrorDetails(span, err, 'sqs');
-              span.d = Date.now() - span.ts;
-              span.transmitManual();
-            });
+          if (res && typeof res.then === 'function') {
+            res
+              .then(() => {
+                span.d = Date.now() - span.ts;
+                span.transmitManual();
+              })
+              .catch(err => {
+                span.ec = 1;
+                tracingUtil.setErrorDetails(span, err, 'sqs');
+                span.d = Date.now() - span.ts;
+                span.transmitManual();
+              });
+          }
 
           return res;
         });
@@ -56,17 +58,19 @@ function instrument(SQSConsumer) {
           span.disableAutoEnd();
           const res = orig.apply(this, arguments);
 
-          res
-            .then(() => {
-              span.d = Date.now() - span.ts;
-              span.transmitManual();
-            })
-            .catch(err => {
-              span.ec = 1;
-              tracingUtil.setErrorDetails(span, err, 'sqs');
-              span.d = Date.now() - span.ts;
-              span.transmitManual();
-            });
+          if (res && typeof res.then === 'function') {
+            res
+              .then(() => {
+                span.d = Date.now() - span.ts;
+                span.transmitManual();
+              })
+              .catch(err => {
+                span.ec = 1;
+                tracingUtil.setErrorDetails(span, err, 'sqs');
+                span.d = Date.now() - span.ts;
+                span.transmitManual();
+              });
+          }
 
           return res;
         });
diff --git a/packages/core/src/tracing/instrumentation/cloud/gcp/storage.js b/packages/core/src/tracing/instrumentation/cloud/gcp/storage.js
index c1d4fbb43d..f91612dbe1 100644
--- a/packages/core/src/tracing/instrumentation/cloud/gcp/storage.js
+++ b/packages/core/src/tracing/instrumentation/cloud/gcp/storage.js
@@ -416,7 +416,7 @@ function instrumentedOperation(operation, extractorPre, extractorPost, ctx, orig
     }
 
     const promise = original.apply(ctx, originalArgs);
-    if (promise) {
+    if (promise && typeof promise.then === 'function') {
       promise.then(
         result => finishSpan(null, Array.isArray(result) ? result[0] : result, span, extractorPost),
         e => finishSpan(e, null, span, extractorPost)
diff --git a/packages/core/src/tracing/instrumentation/control_flow/graphqlSubscriptions.js b/packages/core/src/tracing/instrumentation/control_flow/graphqlSubscriptions.js
index 8197259f91..e7edc1daba 100644
--- a/packages/core/src/tracing/instrumentation/control_flow/graphqlSubscriptions.js
+++ b/packages/core/src/tracing/instrumentation/control_flow/graphqlSubscriptions.js
@@ -62,18 +62,23 @@ function shimPushValue(originalFunction) {
 function shimPullValue(originalFunction) {
   return function () {
     const pullPromise = originalFunction.apply(this, arguments);
-    return pullPromise.then(result => {
-      if (result && result.value && result.value[CLS_CONTEXT_SYMBOL]) {
-        const clsContext = result.value[CLS_CONTEXT_SYMBOL];
-        if (isActive && clsContext) {
-          cls.ns.enter(clsContext);
-          setImmediate(() => {
-            cls.ns.exit(clsContext);
-          });
+
+    if (pullPromise && typeof pullPromise.then === 'function') {
+      return pullPromise.then(result => {
+        if (result && result.value && result.value[CLS_CONTEXT_SYMBOL]) {
+          const clsContext = result.value[CLS_CONTEXT_SYMBOL];
+          if (isActive && clsContext) {
+            cls.ns.enter(clsContext);
+            setImmediate(() => {
+              cls.ns.exit(clsContext);
+            });
+          }
         }
-      }
-      return result;
-    });
+        return result;
+      });
+    }
+
+    return pullPromise;
   };
 }
 
diff --git a/packages/core/src/tracing/instrumentation/databases/couchbase.js b/packages/core/src/tracing/instrumentation/databases/couchbase.js
index 2d7a0df358..dee2b58472 100644
--- a/packages/core/src/tracing/instrumentation/databases/couchbase.js
+++ b/packages/core/src/tracing/instrumentation/databases/couchbase.js
@@ -77,7 +77,7 @@ function instrumentConnect(originalConnect) {
 
     const prom = originalConnect.apply(originalThis, originalArgs);
 
-    if (prom && prom.then) {
+    if (prom && typeof prom.then === 'function') {
       prom.then(cluster => {
         instrumentCluster(cluster, connectionStr);
         return cluster;
@@ -488,7 +488,7 @@ function instrumentOperation({ connectionStr, bucketName, getBucketTypeFn, sql,
       if (callbackIndex < 0) {
         const prom = original.apply(originalThis, originalArgs);
 
-        if (prom.then && prom.catch) {
+        if (typeof prom?.then === 'function' && typeof prom?.catch === 'function') {
           prom
             .then(result => {
               if (resultHandler) {
diff --git a/packages/core/src/tracing/instrumentation/databases/elasticsearch.js b/packages/core/src/tracing/instrumentation/databases/elasticsearch.js
index 4877c53604..46a6f2b774 100644
--- a/packages/core/src/tracing/instrumentation/databases/elasticsearch.js
+++ b/packages/core/src/tracing/instrumentation/databases/elasticsearch.js
@@ -155,10 +155,14 @@ function instrumentApi(client, actionPath, clusterInfo) {
       } else {
         // eslint-disable-next-line no-useless-catch
         try {
-          return originalFunction.apply(ctx, originalArgs).then(onSuccess.bind(null, span), error => {
-            onError(span, error);
-            throw error;
-          });
+          const promise = originalFunction.apply(ctx, originalArgs);
+          if (typeof promise?.then === 'function') {
+            return promise.then(onSuccess.bind(null, span), error => {
+              onError(span, error);
+              throw error;
+            });
+          }
+          return promise;
         } catch (e) {
           // Immediately cleanup on synchronous errors.
           throw e;
@@ -448,10 +452,14 @@ function instrumentedRequest(ctx, origEsReq, originalArgs) {
     } else {
       // eslint-disable-next-line no-useless-catch
       try {
-        return origEsReq.apply(ctx, originalArgs).then(onSuccess.bind(null, span), error => {
-          onError(span, error);
-          throw error;
-        });
+        const promise = origEsReq.apply(ctx, originalArgs);
+        if (typeof promise?.then === 'function') {
+          return promise.then(onSuccess.bind(null, span), error => {
+            onError(span, error);
+            throw error;
+          });
+        }
+        return promise;
       } catch (e) {
         // Immediately cleanup on synchronous errors.
         throw e;
diff --git a/packages/core/src/tracing/instrumentation/databases/ioredis.js b/packages/core/src/tracing/instrumentation/databases/ioredis.js
index e88a1c69e3..f20dc059b7 100644
--- a/packages/core/src/tracing/instrumentation/databases/ioredis.js
+++ b/packages/core/src/tracing/instrumentation/databases/ioredis.js
@@ -97,11 +97,13 @@ function instrumentSendCommand(original) {
       span.stack = tracingUtil.getStackTrace(wrappedInternalSendCommand);
 
       callback = cls.ns.bind(onResult);
-      command.promise.then(
-        // make sure that the first parameter is never truthy
-        callback.bind(null, null),
-        callback
-      );
+      if (typeof command.promise?.then === 'function') {
+        command.promise.then(
+          // make sure that the first parameter is never truthy
+          callback.bind(null, null),
+          callback
+        );
+      }
 
       return original.apply(client, argsForOriginal);
 
@@ -190,7 +192,7 @@ function instrumentMultiOrPipelineExec(clsContextForMultiOrPipeline, commandName
     span.ts = Date.now();
 
     const result = original.apply(this, arguments);
-    if (result.then) {
+    if (typeof result?.then === 'function') {
       result.then(
         results => {
           endCallback.call(null, clsContextForMultiOrPipeline, span, null, results);
diff --git a/packages/core/src/tracing/instrumentation/databases/mongodb.js b/packages/core/src/tracing/instrumentation/databases/mongodb.js
index 7582e1917c..b2928bf976 100644
--- a/packages/core/src/tracing/instrumentation/databases/mongodb.js
+++ b/packages/core/src/tracing/instrumentation/databases/mongodb.js
@@ -457,7 +457,7 @@ function handleCallbackOrPromise(ctx, originalArgs, originalFunction, span) {
 
   const resultPromise = originalFunction.apply(ctx, originalArgs);
 
-  if (resultPromise && resultPromise.then) {
+  if (resultPromise && typeof resultPromise.then === 'function') {
     resultPromise
       .then(result => {
         span.d = Date.now() - span.ts;
diff --git a/packages/core/src/tracing/instrumentation/databases/mssql.js b/packages/core/src/tracing/instrumentation/databases/mssql.js
index d1cf837774..ddd5f199fe 100644
--- a/packages/core/src/tracing/instrumentation/databases/mssql.js
+++ b/packages/core/src/tracing/instrumentation/databases/mssql.js
@@ -88,7 +88,7 @@ function instrumentedMethod(ctx, originalFunction, originalArgs, stackTraceRef,
     }
 
     const promise = originalFunction.apply(ctx, originalArgs);
-    if (typeof promise.then === 'function') {
+    if (typeof promise?.then === 'function') {
       promise
         .then(value => {
           finishSpan(null, span);
diff --git a/packages/core/src/tracing/instrumentation/databases/mysql.js b/packages/core/src/tracing/instrumentation/databases/mysql.js
index a33688fa86..603fa058f2 100644
--- a/packages/core/src/tracing/instrumentation/databases/mysql.js
+++ b/packages/core/src/tracing/instrumentation/databases/mysql.js
@@ -182,20 +182,23 @@ function instrumentedAccessFunction(
     if (isPromiseImpl) {
       const resultPromise = originalFunction.apply(ctx, originalArgs);
 
-      resultPromise
-        .then(result => {
-          span.d = Date.now() - span.ts;
-          span.transmit();
-          return result;
-        })
-        .catch(error => {
-          span.ec = 1;
-          tracingUtil.setErrorDetails(span, error, exports.spanName);
-
-          span.d = Date.now() - span.ts;
-          span.transmit();
-          return error;
-        });
+      if (typeof resultPromise?.then === 'function') {
+        resultPromise
+          .then(result => {
+            span.d = Date.now() - span.ts;
+            span.transmit();
+            return result;
+          })
+          .catch(error => {
+            span.ec = 1;
+            tracingUtil.setErrorDetails(span, error, exports.spanName);
+
+            span.d = Date.now() - span.ts;
+            span.transmit();
+            throw error;
+          });
+      }
+
       return resultPromise;
     }
 
@@ -238,12 +241,15 @@ function shimGetConnection(original) {
 
 function shimPromiseConnection(original) {
   return function getConnection() {
-    return original.apply(this, arguments).then(connection => {
-      shimmer.wrap(connection, 'query', shimPromiseQuery);
-      shimmer.wrap(connection, 'execute', shimPromiseExecute);
-
-      return connection;
-    });
+    const promise = original.apply(this, arguments);
+    if (typeof promise?.then === 'function') {
+      return promise.then(connection => {
+        shimmer.wrap(connection, 'query', shimPromiseQuery);
+        shimmer.wrap(connection, 'execute', shimPromiseExecute);
+
+        return connection;
+      });
+    }
   };
 }
 
diff --git a/packages/core/src/tracing/instrumentation/frameworks/koa.js b/packages/core/src/tracing/instrumentation/frameworks/koa.js
index 48b72c57b4..a7eed9244b 100644
--- a/packages/core/src/tracing/instrumentation/frameworks/koa.js
+++ b/packages/core/src/tracing/instrumentation/frameworks/koa.js
@@ -61,20 +61,21 @@ function instrumentedRoutes(thisContext, originalRoutes, originalArgs) {
   const instrumentedDispatch = function (ctx, next) {
     if (active && cls.isTracing()) {
       const dispatchResult = dispatch.apply(this, arguments);
-      return dispatchResult.then(resolvedValue => {
-        if (ctx.matched && ctx.matched.length && ctx.matched.length > 0) {
-          const matchedRouteLayers = ctx.matched.slice();
-          matchedRouteLayers.sort(byLeastSpecificLayer);
-          const mostSpecificPath = normalizeLayerPath(matchedRouteLayers[matchedRouteLayers.length - 1].path);
-          annotateHttpEntrySpanWithPathTemplate(mostSpecificPath);
-        }
-        return resolvedValue;
-      });
+      if (typeof dispatchResult?.then === 'function') {
+        return dispatchResult.then(resolvedValue => {
+          if (ctx.matched && ctx.matched.length && ctx.matched.length > 0) {
+            const matchedRouteLayers = ctx.matched.slice();
+            matchedRouteLayers.sort(byLeastSpecificLayer);
+            const mostSpecificPath = normalizeLayerPath(matchedRouteLayers[matchedRouteLayers.length - 1].path);
+            annotateHttpEntrySpanWithPathTemplate(mostSpecificPath);
+          }
+          return resolvedValue;
+        });
+      }
     } else {
       return dispatch.apply(this, arguments);
     }
   };
-
   // The router attaches itself as a property to the dispatch function and other methods in koa-router rely on this, so
   // we need to attach this property to our dispatch function, too.
   instrumentedDispatch.router = dispatch.router;
diff --git a/packages/core/src/tracing/instrumentation/messaging/amqp.js b/packages/core/src/tracing/instrumentation/messaging/amqp.js
index d0fcad6b46..6608c1931c 100644
--- a/packages/core/src/tracing/instrumentation/messaging/amqp.js
+++ b/packages/core/src/tracing/instrumentation/messaging/amqp.js
@@ -249,56 +249,60 @@ function instrumentedChannelModelGet(ctx, originalGet, originalArgs) {
       kind: constants.ENTRY
     });
 
-    return originalGet.apply(ctx, originalArgs).then(result => {
-      if (!result) {
-        // get did not fetch a new message from RabbitMQ (because the queue has no messages), no need to create a span.
-        span.cancel();
-        return result;
-      }
-      const fields = result.fields || {};
-      const headers = result.properties && result.properties.headers ? result.properties.headers : {};
-
-      if (tracingUtil.readAttribCaseInsensitive(headers, constants.traceLevelHeaderName) === '0') {
-        cls.setTracingLevel('0');
-        span.cancel();
-        return result;
-      }
+    const promise = originalGet.apply(ctx, originalArgs);
+    if (typeof promise?.then === 'function') {
+      return promise.then(result => {
+        if (!result) {
+          // get did not fetch a new message from RabbitMQ (because the queue has no messages), no need to create a
+          // span.
+          span.cancel();
+          return result;
+        }
+        const fields = result.fields || {};
+        const headers = result.properties && result.properties.headers ? result.properties.headers : {};
 
-      const traceId = tracingUtil.readAttribCaseInsensitive(headers, constants.traceIdHeaderName);
-      const parentSpanId = tracingUtil.readAttribCaseInsensitive(headers, constants.spanIdHeaderName);
-      if (traceId && parentSpanId) {
-        span.t = traceId;
-        span.p = parentSpanId;
-      }
+        if (tracingUtil.readAttribCaseInsensitive(headers, constants.traceLevelHeaderName) === '0') {
+          cls.setTracingLevel('0');
+          span.cancel();
+          return result;
+        }
 
-      span.ts = Date.now();
-      span.stack = tracingUtil.getStackTrace(instrumentedChannelModelGet);
-      span.data.rabbitmq = {
-        sort: 'consume'
-      };
+        const traceId = tracingUtil.readAttribCaseInsensitive(headers, constants.traceIdHeaderName);
+        const parentSpanId = tracingUtil.readAttribCaseInsensitive(headers, constants.spanIdHeaderName);
+        if (traceId && parentSpanId) {
+          span.t = traceId;
+          span.p = parentSpanId;
+        }
 
-      if (ctx.connection.stream) {
-        span.data.rabbitmq.address =
-          typeof ctx.connection.stream.getProtocol === 'function'
-            ? 'amqps://'
-            : //
-              `amqp://${ctx.connection.stream.remoteAddress}:${ctx.connection.stream.remotePort}`;
-      }
-      if (fields.exchange) {
-        span.data.rabbitmq.exchange = fields.exchange;
-      }
-      if (fields.routingKey) {
-        span.data.rabbitmq.key = fields.routingKey;
-      }
+        span.ts = Date.now();
+        span.stack = tracingUtil.getStackTrace(instrumentedChannelModelGet);
+        span.data.rabbitmq = {
+          sort: 'consume'
+        };
+
+        if (ctx.connection.stream) {
+          span.data.rabbitmq.address =
+            typeof ctx.connection.stream.getProtocol === 'function'
+              ? 'amqps://'
+              : //
+                `amqp://${ctx.connection.stream.remoteAddress}:${ctx.connection.stream.remotePort}`;
+        }
+        if (fields.exchange) {
+          span.data.rabbitmq.exchange = fields.exchange;
+        }
+        if (fields.routingKey) {
+          span.data.rabbitmq.key = fields.routingKey;
+        }
 
-      setImmediate(() => {
-        // Client code is expected to end the span manually, end it automatically in case client code doesn't. Child
-        // exit spans won't be captured, but at least the RabbitMQ entry span is there.
-        span.d = Date.now() - span.ts;
-        span.transmit();
+        setImmediate(() => {
+          // Client code is expected to end the span manually, end it automatically in case client code doesn't. Child
+          // exit spans won't be captured, but at least the RabbitMQ entry span is there.
+          span.d = Date.now() - span.ts;
+          span.transmit();
+        });
+        return result;
       });
-      return result;
-    });
+    }
   });
 }
 
diff --git a/packages/core/src/tracing/instrumentation/messaging/bull.js b/packages/core/src/tracing/instrumentation/messaging/bull.js
index f09fc0474d..39f7cdadc9 100644
--- a/packages/core/src/tracing/instrumentation/messaging/bull.js
+++ b/packages/core/src/tracing/instrumentation/messaging/bull.js
@@ -100,15 +100,17 @@ function instrumentedJobCreate(ctx, originalJobCreate, originalArgs, options) {
 
     const promise = originalJobCreate.apply(ctx, originalArgs);
 
-    return promise
-      .then(job => {
-        finishSpan(null, job, span);
-        return job;
-      })
-      .catch(err => {
-        finishSpan(err, null, span);
-        return err;
-      });
+    if (typeof promise?.then === 'function') {
+      return promise
+        .then(job => {
+          finishSpan(null, job, span);
+          return job;
+        })
+        .catch(err => {
+          finishSpan(err, null, span);
+          return err;
+        });
+    }
   });
 }
 
@@ -258,20 +260,22 @@ function instrumentedProcessJob(ctx, originalProcessJob, originalArgs) {
 
     const promise = originalProcessJob.apply(ctx, originalArgs);
 
-    return promise
-      .then(data => {
-        finishSpan(job.failedReason, data, span);
-        // Make sure the instana foreigner data is removed.
-        delete options.X_INSTANA_L;
-        return data;
-      })
-      .catch(err => {
-        addErrorToSpan(err, span);
-        finishSpan(null, null, span);
-        // Make sure the instana foreigner data is removed.
-        delete options.X_INSTANA_L;
-        throw err;
-      });
+    if (promise && typeof promise.then === 'function') {
+      return promise
+        .then(data => {
+          finishSpan(job.failedReason, data, span);
+          // Make sure the instana foreigner data is removed.
+          delete options.X_INSTANA_L;
+          return data;
+        })
+        .catch(err => {
+          addErrorToSpan(err, span);
+          finishSpan(null, null, span);
+          // Make sure the instana foreigner data is removed.
+          delete options.X_INSTANA_L;
+          throw err;
+        });
+    }
   });
 }
 
diff --git a/packages/core/src/tracing/instrumentation/messaging/kafkaJs.js b/packages/core/src/tracing/instrumentation/messaging/kafkaJs.js
index f887225f13..0a44ce1626 100644
--- a/packages/core/src/tracing/instrumentation/messaging/kafkaJs.js
+++ b/packages/core/src/tracing/instrumentation/messaging/kafkaJs.js
@@ -96,20 +96,22 @@ function instrumentedSend(ctx, originalSend, originalArgs, topic, messages) {
     }
     span.stack = tracingUtil.getStackTrace(instrumentedSend);
 
-    return originalSend
-      .apply(ctx, originalArgs)
-      .then(result => {
-        span.d = Date.now() - span.ts;
-        span.transmit();
-        return result;
-      })
-      .catch(error => {
-        span.ec = 1;
-        tracingUtil.setErrorDetails(span, error, 'kafka');
-        span.d = Date.now() - span.ts;
-        span.transmit();
-        throw error;
-      });
+    const promise = originalSend.apply(ctx, originalArgs);
+    if (typeof promise?.then === 'function') {
+      return promise
+        .then(result => {
+          span.d = Date.now() - span.ts;
+          span.transmit();
+          return result;
+        })
+        .catch(error => {
+          span.ec = 1;
+          tracingUtil.setErrorDetails(span, error, 'kafka');
+          span.d = Date.now() - span.ts;
+          span.transmit();
+          throw error;
+        });
+    }
   });
 }
 
@@ -175,20 +177,22 @@ function instrumentedSendBatch(ctx, originalSendBatch, originalArgs, topicMessag
       span.b = { s: messageCount };
     }
 
-    return originalSendBatch
-      .apply(ctx, originalArgs)
-      .then(result => {
-        span.d = Date.now() - span.ts;
-        span.transmit();
-        return result;
-      })
-      .catch(error => {
-        span.ec = 1;
-        tracingUtil.setErrorDetails(span, error, 'kafka');
-        span.d = Date.now() - span.ts;
-        span.transmit();
-        throw error;
-      });
+    const promise = originalSendBatch.apply(ctx, originalArgs);
+    if (typeof promise?.then === 'function') {
+      return promise
+        .then(result => {
+          span.d = Date.now() - span.ts;
+          span.transmit();
+          return result;
+        })
+        .catch(error => {
+          span.ec = 1;
+          tracingUtil.setErrorDetails(span, error, 'kafka');
+          span.d = Date.now() - span.ts;
+          span.transmit();
+          throw error;
+        });
+    }
   });
 }
 
diff --git a/packages/core/src/tracing/instrumentation/protocols/nativeFetch.js b/packages/core/src/tracing/instrumentation/protocols/nativeFetch.js
index 9b72e210f6..d1bf61061c 100644
--- a/packages/core/src/tracing/instrumentation/protocols/nativeFetch.js
+++ b/packages/core/src/tracing/instrumentation/protocols/nativeFetch.js
@@ -171,29 +171,31 @@ function instrument() {
       injectTraceCorrelationHeaders(originalArgs, span, w3cTraceContext);
 
       const fetchPromise = originalFetch.apply(originalThis, originalArgs);
-      fetchPromise
-        .then(response => {
-          span.data.http.status = response.status;
-          span.ec = response.status >= 500 ? 1 : 0;
-          capturedHeaders = mergeExtraHeadersFromFetchHeaders(
-            capturedHeaders,
-            response.headers,
-            extraHttpHeadersToCapture
-          );
-
-          span.d = Date.now() - span.ts;
-          if (capturedHeaders != null && Object.keys(capturedHeaders).length > 0) {
-            span.data.http.header = capturedHeaders;
-          }
-          span.transmit();
-        })
-        .catch(err => {
-          span.ec = 1;
-          tracingUtil.setErrorDetails(span, err, 'http');
-
-          span.d = Date.now() - span.ts;
-          span.transmit();
-        });
+      if (typeof fetchPromise?.then === 'function') {
+        fetchPromise
+          .then(response => {
+            span.data.http.status = response.status;
+            span.ec = response.status >= 500 ? 1 : 0;
+            capturedHeaders = mergeExtraHeadersFromFetchHeaders(
+              capturedHeaders,
+              response.headers,
+              extraHttpHeadersToCapture
+            );
+
+            span.d = Date.now() - span.ts;
+            if (capturedHeaders != null && Object.keys(capturedHeaders).length > 0) {
+              span.data.http.header = capturedHeaders;
+            }
+            span.transmit();
+          })
+          .catch(err => {
+            span.ec = 1;
+            tracingUtil.setErrorDetails(span, err, 'http');
+
+            span.d = Date.now() - span.ts;
+            span.transmit();
+          });
+      }
 
       return fetchPromise;
     });