207 instances in the last day
https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-2020.11.20/clienterror/?id=AXXmug35ENI25UWQyp3E
at VeInitMwDesktopArticleTarget.ve.init.mw.DesktopArticleTarget.onWindowPopState URL1:950:137 URL1: https://ja.wikipedia.org/w/load.php?lang=ja&modules=ext.visualEditor.articleTarget%2Cbase%2Ccore%2CdesktopArticleTarget%2CdesktopTarget%2Cdiffing%2Cicons%2Clanguage%2Cmediawiki%2Cmwalienextension%2Cmwcore%2Cmwextensions%2Cmwformatting%2Cmwgallery%2Cmwimage%2Cmwlanguage%2Cmwlink%2Cmwmeta%2Cmwsave%2Cmwsignature%2Cmwtransclusion%2Csanitize%2Cswitching%2Cwelcome%7Cext.visualEditor.core.desktop%2Cutils%7Cext.visualEditor.mwextensions.desktop%7Cext.visualEditor.mwimage.core&skin=vector&version=nvyky