Error
Request ID: XJU3CwpAIC8AABoWRMYAAACS
PHP Fatal Error: Argument 2 passed to AbuseFilter::executeFilterActions() must be an instance of Title, null given
#0 /srv/mediawiki/php-1.33.0-wmf.22/extensions/AbuseFilter/includes/AbuseFilter.php(1215): NO_FUNCTION_GIVEN()
#1 /srv/mediawiki/php-1.33.0-wmf.22/extensions/AbuseFilter/includes/AbuseFilterHooks.php(837): AbuseFilter::filterAction(AbuseFilterVariableHolder, NULL, string, User)
#2 /srv/mediawiki/php-1.33.0-wmf.22/extensions/AbuseFilter/includes/AbuseFilterHooks.php(752): AbuseFilterHooks::filterUpload(string, UploadFromFile, User, array, NULL, NULL, NULL)
#3 /srv/mediawiki/php-1.33.0-wmf.22/includes/Hooks.php(174): AbuseFilterHooks::onUploadStashFile(UploadFromFile, User, array, NULL)
#4 /srv/mediawiki/php-1.33.0-wmf.22/includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL)
#5 /srv/mediawiki/php-1.33.0-wmf.22/includes/upload/UploadBase.php(1080): Hooks::run(string, array)
#6 /srv/mediawiki/php-1.33.0-wmf.22/includes/upload/UploadBase.php(1060): UploadBase->runUploadStashFileHook(User)
#7 /srv/mediawiki/php-1.33.0-wmf.22/includes/specials/SpecialUpload.php(350): UploadBase->tryStashFile(User)
#8 /srv/mediawiki/php-1.33.0-wmf.22/includes/specials/SpecialUpload.php(707): SpecialUpload->showRecoverableUploadError(string)
#9 /srv/mediawiki/php-1.33.0-wmf.22/includes/specials/SpecialUpload.php(511): SpecialUpload->processVerificationError(array)
#10 /srv/mediawiki/php-1.33.0-wmf.22/includes/specials/SpecialUpload.php(207): SpecialUpload->processUpload()
#11 /srv/mediawiki/php-1.33.0-wmf.22/includes/specialpage/SpecialPage.php(569): SpecialUpload->execute(NULL)
#12 /srv/mediawiki/php-1.33.0-wmf.22/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(NULL)
#13 /srv/mediawiki/php-1.33.0-wmf.22/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#14 /srv/mediawiki/php-1.33.0-wmf.22/includes/MediaWiki.php(867): MediaWiki->performRequest()
#15 /srv/mediawiki/php-1.33.0-wmf.22/includes/MediaWiki.php(517): MediaWiki->main()
#16 /srv/mediawiki/php-1.33.0-wmf.22/index.php(42): MediaWiki->run()
#17 /srv/mediawiki/w/index.php(3): include(string)
#18 {main}Impact
Users cannot upload the image if certain conditions are met (=if a filter of unknown ID matches the action)
Notes
This is well known, and has the same cause as T144265. Basically, if the user inserts an invalid title for an image, we run filters with 'stashupload' action without populating page-related variables. If any filter still matches the action (basically only using user-related and file-related vars) and we try to take any consequence, the exception above is thrown.
Per T144265#4908543 and T144265#4938272, the chosen solution is to not run filters at all if we don't have a title [0], and is already on gerrit as https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/AbuseFilter/+/464119/.
[0]: Note that if the title is invalid, the upload form will ask the user to provide one, and when they do we'll run filters again - with 'upload' action instead of 'stashupload'.