Sjoerddebruin created this task.
Herald added subscribers: StudiesWorld, Aklapper.
Herald added a project: Wikidata.

TASK DESCRIPTION
  I've restored some sitelinks on https://www.wikidata.org/wiki/Q670593 after a 
editor wrongly switched them. After that, 
https://en.wikipedia.org/wiki/Wolfsberg,_Thuringia began to show the following 
error (leaving the rest of the page empty):
  
    Exception encountered, of type "BadMethodCallException"
  
  The full trace (thanks to @Legoktm):
  
    2016-02-28 22:27:33 mw1217 enwiki 1.27.0-wmf.14 exception ERROR: [b158dc6e] 
/wiki/Wolfsberg,_Thuringia   BadMethodCallException from line 300 of 
/srv/mediawiki/php-1.27.0-wmf.14/extensions/WikidataPageBanner/includes/WikidataPageBanner.functions.php:
 Call to a member function getStatements() on a non-object (NULL) 
{"exception_id":"b158dc6e"} 
    [Exception BadMethodCallException] 
(/srv/mediawiki/php-1.27.0-wmf.14/extensions/WikidataPageBanner/includes/WikidataPageBanner.functions.php:300)
 Call to a member function getStatements() on a non-object (NULL)
      #0 
/srv/mediawiki/php-1.27.0-wmf.14/extensions/WikidataPageBanner/includes/WikidataPageBanner.functions.php(241):
 WikidataPageBannerFunctions::getWikidataBanner(Title)
      #1 
/srv/mediawiki/php-1.27.0-wmf.14/extensions/WikidataPageBanner/includes/WikidataPageBanner.hooks.php(125):
 WikidataPageBannerFunctions::getAutomaticBanner(Title)
      #2 /srv/mediawiki/php-1.27.0-wmf.14/includes/Hooks.php(195): 
WikidataPageBanner::onBeforePageDisplay(OutputPage, SkinVector)
      #3 /srv/mediawiki/php-1.27.0-wmf.14/includes/OutputPage.php(2354): 
Hooks::run(string, array)
      #4 /srv/mediawiki/php-1.27.0-wmf.14/includes/MediaWiki.php(746): 
OutputPage->output()
      #5 /srv/mediawiki/php-1.27.0-wmf.14/includes/MediaWiki.php(519): 
MediaWiki->main()
      #6 /srv/mediawiki/php-1.27.0-wmf.14/index.php(43): MediaWiki->run()
      #7 /srv/mediawiki/w/index.php(3): include(string)
      #8 {main}

TASK DETAIL
  https://phabricator.wikimedia.org/T128342

EMAIL PREFERENCES
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To: Sjoerddebruin
Cc: hoo, Sjoerddebruin, Aklapper, Legoktm, StudiesWorld, D3r1ck01, Izno, 
Wikidata-bugs, aude, Lydia_Pintscher, Mbch331



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