This error is thrown several times on startup on this page:
https://it.m.wikipedia.org/w/index.php?title=Lanci_del_Falcon_9_e_del_Falcon_Heavy&oldid=117142588
It seems to be another example of where user content can throw a JS error.
at partition URL1:758:907 at Stack.prototype.batchTransform URL1:758:89 at Stack.prototype.transform URL1:720:814 at Stack.prototype.evaluate URL1:760:151 at Model.prototype.evaluate URL1:472:334 at Model.prototype.propagate URL1:469:413 at GroupBuilder.inlineDs URL1:664:761 at GroupBuilder.proto.init URL1:663:272 at GroupBuilder.proto.init URL1:673:802 at GroupBuilder.buildMarks URL1:678:32 URL1: https://it.m.wikipedia.org/w/load.php?lang=it&modules=ext.categoryTree%2CeventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2ClargeBannerLimit%2ClegacySupport%2CstartUp%7Cext.centralauth.centralautologin%7Cext.graph.data%2Cvega2%7Cext.relatedArticles.readMore.bootstrap%2Cgateway%7Cjquery%2Coojs%2Coojs-router%2Csite%7Cjquery.client%2Ccookie%2Cthrottle-debounce%7Cmediawiki.String%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2Cviewport%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmediawiki.ui.anchor%7Cmobile.init%2Cstartup%7Cmobile.messageBox.styles%7Cmobile.ooui.icons%7Cmobile.pagelist.styles%7Cmobile.pagesummary.styles%7Cmobile.placeholder.images%7Cmobile.startup.images%7Cmw.externalguidance.init%7Cskins.minerva.icons.images.scripts%7Cskins.minerva.icons.images.scripts.misc%7Cskins.minerva.icons.page.issues.default.color%7Cskins.minerva.icons.page.issues.medium.color%7Cskins.minerva.icons.page.issues.uncolored%7Cskins.minerva.options%2Cscripts%7Cuser.defaults&skin=minerva&version=knbkg