https://logstash.wikimedia.org/app/dashboards#/doc/logstash-*/logstash-2021.03.19?id=J6rjSngBWKe2MTdR9R9p
Observed on https://en.wikipedia.org/wiki/Internet#Social_impact
When dragging on the visualization in Firefox, I can trigger the error "TypeError: datum.firstYear is undefined"
In Chrome this appears as "Cannot read property 'value' of undefined".
The same graph seems to be associated with "RangeError: Invalid array length"
```
at Collector.proto.values URL1:308:99
at Facetor.proto.changes URL1:306:618
at Aggregate.prototype.transform URL1:632:317
at Aggregate.prototype.evaluate URL1:672:151
at Scale.dataRef URL1:598:955
at Scale.domainMinMax URL1:599:762
at Scale.quantitative URL1:595:831
at Scale.scale URL1:592:971
at fn URL1:592:300
URL1: https://en.wikipedia.org/w/load.php?lang=en&modules=ext.graph.data%2Cvega2%7Cext.scribunto.logs%7Cjquery%7Cjquery.makeCollapsible%2Cthrottle-debounce%7Cmediawiki.page.gallery%7Cmediawiki.toc&skin=vector&version=pbe7f
```
Note this error is not being logged as much as it should be due to a bug in the instrumentation code (see T277902), and can be trigged multiple times, so is very dangerous left unfixed.