Edit an article on mobile on iOS, then save it. After the save this will be in the console:
VM32 jquery.js:3819 jQuery.Deferred exception: Cannot read property 'getView' of null TypeError: Cannot read property 'getView' of null at VeInitMwMobileArticleTarget.ve.init.mw.MobileArticleTarget.onSurfaceScroll (http://dev.wiki.local.wmftest.net:8080/w/extensions/VisualEditor/modules/ve-mw/init/targets/ve.init.mw.MobileArticleTarget.js?215d9:249:38) at VeUiMWSurface.oo.EventEmitter.emit (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/oojs/oojs.jquery.js?b1631:824:12) at http://dev.wiki.local.wmftest.net:8080/w/extensions/VisualEditor/lib/ve/src/ui/ve.ui.Surface.js?afd47:560:12 at mightThrow (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6fb03:3535:29) at process (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6fb03:3603:12) undefined