Lucas_Werkmeister_WMDE added a comment.

  This can also happen in production logstash, by the way:
  
  ---
  
  Error
  -----
  
  - mwversion: `1.37.0-wmf.9`
  - reqId: `29c2eca6-5f3a-41ff-b456-d32f0a749584`
  - Find reqId in Logstash 
<https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-06-14T10:22:12.000Z',to:'2021-06-15T10:25:25.525Z'))&_a=(query:(query_string:(query:'reqId:%2229c2eca6-5f3a-41ff-b456-d32f0a749584%22')))>
  - Find normalized_message in Logstash 
<https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:now-30d,to:now))&_a=(query:(query_string:(query:'normalized_message:%22%5B%7BreqId%7D%5D%20%7Bexception_url%7D%20%20%20Serializers%5CExceptions%5CUnsupportedObjectException:%20Can%20not%20serialize%20incomplete%20Lexeme%22')))>
  
  
  
  name=normalized_message
    [{reqId}] {exception_url}   
Serializers\Exceptions\UnsupportedObjectException: Can not serialize incomplete 
Lexeme
  
  
  
  name=exception.trace
    from 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/WikibaseLexeme/src/Serialization/StorageLexemeSerializer.php(109)
    #0 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/WikibaseLexeme/src/Serialization/StorageLexemeSerializer.php(80):
 
Wikibase\Lexeme\Serialization\StorageLexemeSerializer->getSerialized(Wikibase\Lexeme\Domain\Model\Lexeme)
    #1 
/srv/mediawiki/php-1.37.0-wmf.9/vendor/serialization/serialization/src/Serializers/DispatchingSerializer.php(42):
 
Wikibase\Lexeme\Serialization\StorageLexemeSerializer->serialize(Wikibase\Lexeme\Domain\Model\Lexeme)
    #2 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/lib/includes/Store/EntityContentDataCodec.php(152):
 
Serializers\DispatchingSerializer->serialize(Wikibase\Lexeme\Domain\Model\Lexeme)
    #3 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/Content/EntityContent.php(327):
 
Wikibase\Lib\Store\EntityContentDataCodec->encodeEntity(Wikibase\Lexeme\Domain\Model\Lexeme,
 string)
    #4 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/RepoHooks.php(648):
 Wikibase\Repo\Content\EntityContent->getTextForFilters()
    #5 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(338): 
Wikibase\Repo\RepoHooks::onAbuseFilterContentToString(Wikibase\Lexeme\MediaWiki\Content\LexemeContent,
 NULL)
    #6 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(137): 
MediaWiki\HookContainer\HookContainer->callLegacyHook(string, array, array, 
array)
    #7 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/Hooks/AbuseFilterHookRunner.php(89):
 MediaWiki\HookContainer\HookContainer->run(string, array)
    #8 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/TextExtractor.php(85):
 
MediaWiki\Extension\AbuseFilter\Hooks\AbuseFilterHookRunner->onAbuseFilter_contentToString(Wikibase\Lexeme\MediaWiki\Content\LexemeContent,
 NULL)
    #9 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/AbuseFilterHooks.php(76):
 
MediaWiki\Extension\AbuseFilter\TextExtractor->contentToString(Wikibase\Lexeme\MediaWiki\Content\LexemeContent)
    #10 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/AbuseFilterHooks.php(45):
 
MediaWiki\Extension\AbuseFilter\AbuseFilterHooks::filterEdit(DerivativeContext, 
User, Wikibase\Lexeme\MediaWiki\Content\LexemeContent, string, string)
    #11 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(338): 
MediaWiki\Extension\AbuseFilter\AbuseFilterHooks::onEditFilterMergedContent(DerivativeContext,
 Wikibase\Lexeme\MediaWiki\Content\LexemeContent, Status, string, User, 
boolean, string)
    #12 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(137): 
MediaWiki\HookContainer\HookContainer->callLegacyHook(string, array, array, 
array)
    #13 /srv/mediawiki/php-1.37.0-wmf.9/includes/Hooks.php(137): 
MediaWiki\HookContainer\HookContainer->run(string, array, array)
    #14 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/MediawikiEditFilterHookRunner.php(105):
 Hooks::run(string, array)
    #15 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/StatsdTimeRecordingEditFilterHookRunner.php(47):
 
Wikibase\Repo\EditEntity\MediawikiEditFilterHookRunner->run(Wikibase\Lexeme\Domain\Model\Lexeme,
 DerivativeContext, string)
    #16 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/MediawikiEditEntity.php(723):
 
Wikibase\Repo\EditEntity\StatsdTimeRecordingEditFilterHookRunner->run(Wikibase\Lexeme\Domain\Model\Lexeme,
 DerivativeContext, string)
    #17 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/StatsdSaveTimeRecordingEditEntity.php(77):
 
Wikibase\Repo\EditEntity\MediawikiEditEntity->attemptSave(Wikibase\Lexeme\Domain\Model\Lexeme,
 string, integer, string, boolean, array)
    #18 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/Api/EntitySavingHelper.php(392):
 
Wikibase\Repo\EditEntity\StatsdSaveTimeRecordingEditEntity->attemptSave(Wikibase\Lexeme\Domain\Model\Lexeme,
 string, integer, string, NULL, array)
    #19 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/Api/ModifyEntity.php(327):
 
Wikibase\Repo\Api\EntitySavingHelper->attemptSaveEntity(Wikibase\Lexeme\Domain\Model\Lexeme,
 string, array, DerivativeContext)
    #20 /srv/mediawiki/php-1.37.0-wmf.9/includes/api/ApiMain.php(1714): 
Wikibase\Repo\Api\ModifyEntity->execute()
    #21 /srv/mediawiki/php-1.37.0-wmf.9/includes/api/ApiMain.php(684): 
ApiMain->executeAction()
    #22 /srv/mediawiki/php-1.37.0-wmf.9/includes/api/ApiMain.php(655): 
ApiMain->executeActionWithErrorHandling()
    #23 /srv/mediawiki/php-1.37.0-wmf.9/api.php(90): ApiMain->execute()
    #24 /srv/mediawiki/php-1.37.0-wmf.9/api.php(45): wfApiMain()
    #25 /srv/mediawiki/w/api.php(3): require(string)
    #26 {main}
  
  name=exception.previous.trace
    from 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/WikibaseLexeme/src/Domain/Model/Lexeme.php(232)
    #0 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/WikibaseLexeme/src/Serialization/StorageLexemeSerializer.php(106):
 Wikibase\Lexeme\Domain\Model\Lexeme->getLexicalCategory()
    #1 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/WikibaseLexeme/src/Serialization/StorageLexemeSerializer.php(80):
 
Wikibase\Lexeme\Serialization\StorageLexemeSerializer->getSerialized(Wikibase\Lexeme\Domain\Model\Lexeme)
    #2 
/srv/mediawiki/php-1.37.0-wmf.9/vendor/serialization/serialization/src/Serializers/DispatchingSerializer.php(42):
 
Wikibase\Lexeme\Serialization\StorageLexemeSerializer->serialize(Wikibase\Lexeme\Domain\Model\Lexeme)
    #3 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/lib/includes/Store/EntityContentDataCodec.php(152):
 
Serializers\DispatchingSerializer->serialize(Wikibase\Lexeme\Domain\Model\Lexeme)
    #4 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/Content/EntityContent.php(327):
 
Wikibase\Lib\Store\EntityContentDataCodec->encodeEntity(Wikibase\Lexeme\Domain\Model\Lexeme,
 string)
    #5 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/RepoHooks.php(648):
 Wikibase\Repo\Content\EntityContent->getTextForFilters()
    #6 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(338): 
Wikibase\Repo\RepoHooks::onAbuseFilterContentToString(Wikibase\Lexeme\MediaWiki\Content\LexemeContent,
 NULL)
    #7 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(137): 
MediaWiki\HookContainer\HookContainer->callLegacyHook(string, array, array, 
array)
    #8 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/Hooks/AbuseFilterHookRunner.php(89):
 MediaWiki\HookContainer\HookContainer->run(string, array)
    #9 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/TextExtractor.php(85):
 
MediaWiki\Extension\AbuseFilter\Hooks\AbuseFilterHookRunner->onAbuseFilter_contentToString(Wikibase\Lexeme\MediaWiki\Content\LexemeContent,
 NULL)
    #10 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/AbuseFilterHooks.php(76):
 
MediaWiki\Extension\AbuseFilter\TextExtractor->contentToString(Wikibase\Lexeme\MediaWiki\Content\LexemeContent)
    #11 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/AbuseFilter/includes/AbuseFilterHooks.php(45):
 
MediaWiki\Extension\AbuseFilter\AbuseFilterHooks::filterEdit(DerivativeContext, 
User, Wikibase\Lexeme\MediaWiki\Content\LexemeContent, string, string)
    #12 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(338): 
MediaWiki\Extension\AbuseFilter\AbuseFilterHooks::onEditFilterMergedContent(DerivativeContext,
 Wikibase\Lexeme\MediaWiki\Content\LexemeContent, Status, string, User, 
boolean, string)
    #13 
/srv/mediawiki/php-1.37.0-wmf.9/includes/HookContainer/HookContainer.php(137): 
MediaWiki\HookContainer\HookContainer->callLegacyHook(string, array, array, 
array)
    #14 /srv/mediawiki/php-1.37.0-wmf.9/includes/Hooks.php(137): 
MediaWiki\HookContainer\HookContainer->run(string, array, array)
    #15 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/MediawikiEditFilterHookRunner.php(105):
 Hooks::run(string, array)
    #16 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/StatsdTimeRecordingEditFilterHookRunner.php(47):
 
Wikibase\Repo\EditEntity\MediawikiEditFilterHookRunner->run(Wikibase\Lexeme\Domain\Model\Lexeme,
 DerivativeContext, string)
    #17 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/MediawikiEditEntity.php(723):
 
Wikibase\Repo\EditEntity\StatsdTimeRecordingEditFilterHookRunner->run(Wikibase\Lexeme\Domain\Model\Lexeme,
 DerivativeContext, string)
    #18 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/EditEntity/StatsdSaveTimeRecordingEditEntity.php(77):
 
Wikibase\Repo\EditEntity\MediawikiEditEntity->attemptSave(Wikibase\Lexeme\Domain\Model\Lexeme,
 string, integer, string, boolean, array)
    #19 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/Api/EntitySavingHelper.php(392):
 
Wikibase\Repo\EditEntity\StatsdSaveTimeRecordingEditEntity->attemptSave(Wikibase\Lexeme\Domain\Model\Lexeme,
 string, integer, string, NULL, array)
    #20 
/srv/mediawiki/php-1.37.0-wmf.9/extensions/Wikibase/repo/includes/Api/ModifyEntity.php(327):
 
Wikibase\Repo\Api\EntitySavingHelper->attemptSaveEntity(Wikibase\Lexeme\Domain\Model\Lexeme,
 string, array, DerivativeContext)
    #21 /srv/mediawiki/php-1.37.0-wmf.9/includes/api/ApiMain.php(1714): 
Wikibase\Repo\Api\ModifyEntity->execute()
    #22 /srv/mediawiki/php-1.37.0-wmf.9/includes/api/ApiMain.php(684): 
ApiMain->executeAction()
    #23 /srv/mediawiki/php-1.37.0-wmf.9/includes/api/ApiMain.php(655): 
ApiMain->executeActionWithErrorHandling()
    #24 /srv/mediawiki/php-1.37.0-wmf.9/api.php(90): ApiMain->execute()
    #25 /srv/mediawiki/php-1.37.0-wmf.9/api.php(45): wfApiMain()
    #26 /srv/mediawiki/w/api.php(3): require(string)
    #27 {main}
  
  
  
  ---
  
  I assume the reason we haven’t spotted it as a production error before is 
that these broken requests are almost never made. (The API response is _not_ an 
internal error, by the way, but a regular API usage error. This exception is 
only logged internally.)

TASK DETAIL
  https://phabricator.wikimedia.org/T255566

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Lucas_Werkmeister_WMDE
Cc: Addshore, Lucas_Werkmeister_WMDE, Aklapper, Michael, Invadibot, 
maantietaja, Akuckartz, darthmon_wmde, DannyS712, Nandana, Lahi, Gq86, 
GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Izno, 
Wikidata-bugs, aude, Dinoguy1000, Mbch331, Jay8g
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