[[https://logstash.wikimedia.org/app/kibana#/dashboard/0235ff00-e117-11e7-b44e-57c02cbb2088?_g=(refreshInterval:(display:Off,pause:!f,value:0),time:(from:now-7d,mode:quick,to:now))&_a=(description:'errors%20under%20the%20MediaWiki%5CExtensions%5CReadingLists%20namespace',filters:!(('$state':(store:appState),meta:(alias:!n,disabled:!f,index:'logstash-*',key:_type,negate:!f,type:phrase,value:mediawiki),query:(match:(_type:(query:mediawiki)))),('$state':(store:appState),meta:(alias:!n,disabled:!f,index:'logstash-*',key:channel,negate:!f,params:!(exception,wfLogDBError),type:phrases,value:'exception,%20wfLogDBError'),query:(bool:(minimum_should_match:1,should:!((match_phrase:(channel:exception)),(match_phrase:(channel:wfLogDBError)))))),('$state':(store:appState),meta:(alias:'thrown%20from%20RL%20or%20DB%20exception%20for%20RL-generated%20query',disabled:!f,index:'logstash-*',key:query,negate:!f,type:custom,value:'%7B%22bool%22:%7B%22should%22:%5B%7B%22match%22:%7B%22exception.file%22:%7B%22query%22:%22extensions%2FReadingLists%22,%22type%22:%22phrase%22%7D%7D%7D,%7B%22match%22:%7B%22exception.message%22:%7B%22query%22:%22ReadingListRepository%22,%22type%22:%22phrase%22%7D%7D%7D%5D%7D%7D'),query:(bool:(should:!((match:(exception.file:(query:extensions%2FReadingLists,type:phrase))),(match:(exception.message:(query:ReadingListRepository,type:phrase))))))),('$state':(store:appState),meta:(alias:!n,disabled:!f,index:'logstash-*',key:normalized_message.raw,negate:!f,type:phrase,value:'%5B%7Bexception_id%7D%5D%20%7Bexception_url%7D%20%20%20LogicException%20from%20line%20248%20of%20%2Fsrv%2Fmediawiki%2Fphp-1.31.0-wmf.24%2Fextensions%2FReadingLists%2Fsrc%2FReadingListRepository.php:%20Encountered%20deleted%20list%20with%20non-unique%20name'),query:(match:(normalized_message.raw:(query:'%5B%7Bexception_id%7D%5D%20%7Bexception_url%7D%20%20%20LogicException%20from%20line%20248%20of%20%2Fsrv%2Fmediawiki%2Fphp-1.31.0-wmf.24%2Fextensions%2FReadingLists%2Fsrc%2FReadingListRepository.php:%20Encountered%20deleted%20list%20with%20non-unique%20name',type:phrase))))),options:(darkTheme:!f),panels:!((col:1,id:Trending-Messages,panelIndex:6,row:6,size_x:6,size_y:3,type:visualization),(col:10,id:MediaWiki-Versions,panelIndex:8,row:3,size_x:3,size_y:3,type:visualization),(col:1,id:Top-Hosts-table,panelIndex:12,row:3,size_x:6,size_y:3,type:visualization),(col:7,id:Top-Wikis-table,panelIndex:13,row:3,size_x:3,size_y:3,type:visualization),(col:1,id:Events-Over-Time,panelIndex:14,row:1,size_x:12,size_y:2,type:visualization),(col:1,columns:!(level,channel,host,wiki,message),id:MediaWiki-Events-List,panelIndex:15,row:9,size_x:12,size_y:16,sort:!('@timestamp',desc),type:search),(col:7,id:Trending-Backtrace-File,panelIndex:16,row:6,size_x:6,size_y:3,type:visualization)),query:(query_string:(analyze_wildcard:!t,query:'*')),timeRestore:!t,title:readinglists-errors,uiState:(P-12:(vis:(params:(sort:(columnIndex:!n,direction:!n)))),P-13:(vis:(params:(sort:(columnIndex:!n,direction:!n)))),P-16:(vis:(params:(sort:(columnIndex:0,direction:asc)))),P-6:(spy:(mode:(fill:!f,name:!n)),vis:(params:(sort:(columnIndex:0,direction:desc))))),viewMode:view)|Rare]], but happens.
```
#0 /srv/mediawiki/php-1.31.0-wmf.24/extensions/ReadingLists/src/Api/ApiReadingListsCreate.php(33): MediaWiki\Extensions\ReadingLists\ReadingListRepository->addList(string, string)
#1 /srv/mediawiki/php-1.31.0-wmf.24/extensions/ReadingLists/src/Api/ApiReadingLists.php(46): MediaWiki\Extensions\ReadingLists\Api\ApiReadingListsCreate->execute()
#2 /srv/mediawiki/php-1.31.0-wmf.24/includes/api/ApiMain.php(1580): MediaWiki\Extensions\ReadingLists\Api\ApiReadingLists->execute()
#3 /srv/mediawiki/php-1.31.0-wmf.24/includes/api/ApiMain.php(542): ApiMain->executeAction()
#4 /srv/mediawiki/php-1.31.0-wmf.24/includes/api/ApiMain.php(513): ApiMain->executeActionWithErrorHandling()
#5 /srv/mediawiki/php-1.31.0-wmf.24/api.php(94): ApiMain->execute()
#6 /srv/mediawiki/w/api.php(3): include(string)
#7 {main}
```