From ebe277cd65ccb88dc5e9775e2c2fb23cc246f33a Mon Sep 17 00:00:00 2001
From: water <672684719@qq.com>
Date: Sun, 16 Aug 2026 16:24:48 +0800
Subject: [PATCH] fix(tooltip): guard against removed series in cached axis
 tooltip params

Fixes #21732

_showAxisTooltip iterates `axisItem.seriesDataIndices` whose seriesIndex
values come from the cached `_lastDataByCoordSys` pointer state. When a
merged setOption removes series (e.g. `replaceMerge: ['series']`), those
indices become stale and `getSeriesByIndex` returns undefined, causing:

  Uncaught TypeError: Cannot read properties of undefined (reading getDataParams)

Also moved the `!axisModel` guard before the `axisModel.axis` access so a
removed axis handles the same way instead of crashing earlier.
---
 src/component/tooltip/TooltipView.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/component/tooltip/TooltipView.ts b/src/component/tooltip/TooltipView.ts
index 044a12ffca..b10ff63552 100644
--- a/src/component/tooltip/TooltipView.ts
+++ b/src/component/tooltip/TooltipView.ts
@@ -555,11 +555,11 @@ class TooltipView extends ComponentView {
             each(itemCoordSys.dataByAxis, function (axisItem) {
                 const axisModel = ecModel.getComponent(axisItem.axisDim + 'Axis', axisItem.axisIndex) as AxisBaseModel;
                 const axisValue = axisItem.value;
-                const axis = axisModel.axis;
-                const axisValueParsed = axis.scale.parse(axisValue);
                 if (!axisModel || axisValue == null) {
                     return;
                 }
+                const axis = axisModel.axis;
+                const axisValueParsed = axis.scale.parse(axisValue);
                 // FIXME: when using `tooltip.trigger: 'axis'`, the precision of the axis value displayed in tooltip
                 //  should match the original series values rather than using the default strategy in Interval.ts
                 //  (getPrecision(interval) + 2); otherwise it may cause confusion.
@@ -578,6 +578,9 @@ class TooltipView extends ComponentView {
 
                 each(axisItem.seriesDataIndices, function (idxItem) {
                     const series = ecModel.getSeriesByIndex(idxItem.seriesIndex);
+                    if (!series) {
+                        return;
+                    }
                     const dataIndex = idxItem.dataIndexInside;
                     const cbParams = series.getDataParams(dataIndex) as TooltipCallbackDataParams;
                     // Can't find data.