Ovilia commented on issue #15464:
URL: https://github.com/apache/echarts/issues/15464#issuecomment-891666418
Another related problem is that if `tooltip.formatter` is defined and
returns `null` for null data, the previous data value is used, which is even
more confusing.
```js
formatter: function(param) {
return param[0].value[1] == null ? null : 'value: ' +
param[0].value[1];
}
```
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