diff --git a/client/src/driver/instascan.js b/client/src/driver/instascan.js
index bca07b88..8ed3a2bb 100644
--- a/client/src/driver/instascan.js
+++ b/client/src/driver/instascan.js
@@ -15,7 +15,7 @@ if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
     document.body.appendChild(script)
   }
 
-  const Instascan$ = O.fromEvent(document.body, 'load', true).filter(e => e.target.src.endsWith('/instascan.min.js')).map(_ => window.Instascan).share()
+  const Instascan$ = O.fromEvent(document.body, 'load', true).filter(e => e.target.src?.endsWith('/instascan.min.js')).map(_ => window.Instascan).share()
       , Scanner$   = Instascan$.map(Instascan => Instascan.Scanner)
       , Camera$    = Instascan$.map(Instascan => Instascan.Camera)