The following error occurs after saving on mobile VE:
VM31 jquery.js:3818 jQuery.Deferred exception: Cannot read property 'getScrollContainer' of null TypeError: Cannot read property 'getScrollContainer' of null at VeUiMWSurface.ve.ui.Surface.toggleMobileGlobalOverlay (http://dev.wiki.local.wmftest.net:8080/w/extensions/VisualEditor/lib/ve/src/ui/ve.ui.Surface.js?88f5b:608:36) at http://dev.wiki.local.wmftest.net:8080/w/extensions/VisualEditor/lib/ve/src/ui/ve.ui.Surface.js?88f5b:587:16 at fire (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6a07d:3268:31) at Object.fireWith [as resolveWith] (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6a07d:3398:7) at Object.deferred.(anonymous function) [as resolve] (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6a07d:3736:36) at http://dev.wiki.local.wmftest.net:8080/w/resources/lib/ooui/oojs-ui-windows.js?1ebec:1522:21 at mightThrow (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6a07d:3534:29) at process (http://dev.wiki.local.wmftest.net:8080/w/resources/lib/jquery/jquery.js?6a07d:3602:12) undefined
Because it's in a Deferred, it doesn't actually interfere with anything.