I was trying to submit a change to
https://pt.wikipedia.org/wiki/Uni%C3%A3o_%28matem%C3%A1tica%29?veaction=edit
but the edito got stuck and this error appeared:
{ "errorMessage": "TypeError: str is undefined", "url": "https://pt.wikipedia.org/w/load.php?debug=false&lang=pt&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=J%2FhCC8P1 line 4 > eval", "lineNumber": 40, "columnNumber": 1146, "errorObject": {} }