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@Bugreporter Thanks for reporting this issue. In the future, please include the exception identifier part of the error.
For example, when I opened, it, I saw:
[W24eCwpAIDEAAIesA2IAAADE] 2018-08-10 23:22:14: Fatal exception of type "BadMethodCallException"
I can use this to find the internal error details in the server logs ("Wikimedia Logstash").
For this ID, I found:
Call to a member function getId() on a non-object (null) #0 /srv/mediawiki/php-1.32.0-wmf.16/includes/Storage/DerivedPageDataUpdater.php(520): Revision->getId() #1 /srv/mediawiki/php-1.32.0-wmf.16/includes/Storage/DerivedPageDataUpdater.php(738): MediaWiki\Storage\DerivedPageDataUpdater->grabCurrentRevision() #2 /srv/mediawiki/php-1.32.0-wmf.16/includes/page/WikiPage.php(1948): MediaWiki\Storage\DerivedPageDataUpdater->prepareContent(User, MediaWiki\Storage\RevisionSlotsUpdate, boolean) #3 /srv/mediawiki/php-1.32.0-wmf.16/includes/page/Article.php(2476): WikiPage->prepareContentForEdit(WikitextContent, NULL, User, NULL, boolean) #4 /srv/mediawiki/php-1.32.0-wmf.16/extensions/AbuseFilter/includes/AFComputedVariable.php(212): Article->prepareContentForEdit(WikitextContent)