jonavila commented on issue #14293:
URL: https://github.com/apache/echarts/issues/14293#issuecomment-790918020
I ran into this issue in 5.x and I believe it's caused by this method of
Series.ts
```
private _initSelectedMapFromData(data: List) {
// Ignore select info in data if selectedMap exists.
// NOTE It's only for legacy usage. edge data is not supported.
if (this.option.selectedMap) {
return;
}
const dataIndices: number[] = [];
if (data.hasItemOption) {
data.each(function (idx) {
const rawItem = data.getRawDataItem(idx);
if (typeof rawItem === 'object'
&& (rawItem as OptionDataItemObject<unknown>).selected
) {
dataIndices.push(idx);
}
});
}
if (dataIndices.length > 0) {
this._innerSelect(data, dataIndices);
}
}
```
You can see how it fails if rawItem is null because typeof null === 'object'.
Using undefined in the value instead of null works for me as workaround.
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