Traffic is low (6 errors in last 7 days) but raising in case it breaks an important workfloe.
https://logstash.wikimedia.org/app/dashboards#/doc/logstash-*/logstash-2021.05.22?id=ttANlXkBStjVNP_PKf3W
```name=message
DataCloneError: Failed to execute 'pushState' on 'History': HTMLLIElement object could not be cloned.
```
```name=trace
at Object.changeUrl URL1:98:850
at Object.changeFilter URL1:98:423
at HTMLButtonElement.<anonymous> URL1:83:358
at HTMLButtonElement.dispatch URL1:176:214
at HTMLButtonElement.elemData.handle URL1:172:848
URL1: https://meta.wikimedia.org/w/load.php?lang=en&modules=ext.translate.base%2Cdropdownmenu%2Ceditor%2Cgroupselector%2Cloader%2Cmessagetable%2Cparsers%2Crecentgroups%2Cstatsbar%7Cext.translate.special.translate%7Cjquery%7Cjquery.makeCollapsible.styles%7Cjquery.ui&skin=vector&version=1o4qi
```
Using mediawiki.router might help here.
== Impact
No user visible impact other than error on the developer console.