2018-03-15 23:47:41 [WqsGHQpAICIAAB5V6dwAAAAA] mw1332 enwiki 1.31.0-wmf.25 exception ERROR: [WqsGHQpAICIAAB5V6dwAAAAA] /wiki/Special:Book   ApiUsageException from line 1972 of /srv/mediawiki/php-1.31.0-wmf.25/includes/api/ApiBase.php: Could not create a new page. It already exists. {"exception_id":"WqsGHQpAICIAAB5V6dwAAAAA","exception_url":"/wiki/Special:Book","caught_by":"mwe_handler"}
[Exception ApiUsageException] (/srv/mediawiki/php-1.31.0-wmf.25/includes/api/ApiBase.php:1972) Could not create a new page. It already exists.
  #0 /srv/mediawiki/php-1.31.0-wmf.25/includes/api/ApiEditPage.php(498): ApiBase->dieStatus(Status)
  #1 /srv/mediawiki/php-1.31.0-wmf.25/includes/api/ApiMain.php(1580): ApiEditPage->execute()
  #2 /srv/mediawiki/php-1.31.0-wmf.25/includes/api/ApiMain.php(511): ApiMain->executeAction()
  #3 /srv/mediawiki/php-1.31.0-wmf.25/extensions/Collection/Collection.body.php(1036): ApiMain->execute()
  #4 /srv/mediawiki/php-1.31.0-wmf.25/extensions/Collection/Collection.body.php(344): SpecialCollection->saveCollection(Title, boolean)
  #5 /srv/mediawiki/php-1.31.0-wmf.25/extensions/Collection/Collection.body.php(223): SpecialCollection->processSaveCollectionCommand()
  #6 /srv/mediawiki/php-1.31.0-wmf.25/includes/specialpage/SpecialPage.php(522): SpecialCollection->execute(NULL)
  #7 /srv/mediawiki/php-1.31.0-wmf.25/includes/specialpage/SpecialPageFactory.php(579): SpecialPage->run(NULL)
  #8 /srv/mediawiki/php-1.31.0-wmf.25/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Title, RequestContext)
  #9 /srv/mediawiki/php-1.31.0-wmf.25/includes/MediaWiki.php(861): MediaWiki->performRequest()
  #10 /srv/mediawiki/php-1.31.0-wmf.25/includes/MediaWiki.php(524): MediaWiki->main()
  #11 /srv/mediawiki/php-1.31.0-wmf.25/index.php(42): MediaWiki->run()
  #12 /srv/mediawiki/w/index.php(3): include(string)
  #13 {main}