waterWang commented on issue #21732:
URL: https://github.com/apache/echarts/issues/21732#issuecomment-5306522864
I've submitted PR #21737 to fix this.
## Root cause
`TooltipView._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 cached indices become stale and `getSeriesByIndex` returns `undefined`,
causing the `getDataParams` crash.
## Fix (two guards)
1. Skip stale `seriesDataIndices` entries whose series no longer exists (`if
(!series) { return; }`)
2. Moved the existing `!axisModel` guard **before** the `axisModel.axis`
access (it was previously checked after being dereferenced)
The fix is a pure TypeScript change in
`src/component/tooltip/TooltipView.ts`, no API changes required.
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