[Bug 39499] New: When trying to add a data, I see "null"

https://bugzilla.wikimedia.org/show_bug.cgi?id=39499

       Web browser: ---
             Bug #: 39499
           Summary: When trying to add a data, I see "null"
           Product: MediaWiki extensions
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Unprioritized
         Component: WikidataRepo
        AssignedTo: wikidata-bugs <at> lists.wikimedia.org
        ReportedBy: luca.came93 <at> gmail.com
                CC: wikidata-bugs <at> lists.wikimedia.org
    Classification: Unclassified
   Mobile Platform: ---

When I click on "add", in any page, a new blue line appears, with the text
"null" instead of the textbox. If I repeatedly click "add" I get further lines,
all with the text "null". Before I got this error I've been able to add a few
data, though.

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