==== Error ====
* mwversion: `1.37.0-wmf.6`
* reqId: `41696e7f-a795-412a-af25-49beeec831be`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-05-18T18:16:57.000Z',to:'2021-05-19T18:33:48.318Z'))&_a=(query:(query_string:(query:'reqId:%2241696e7f-a795-412a-af25-49beeec831be%22'))) | Find reqId 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%20TypeError:%20Argument%202%20passed%20to%20UploadStash::__construct()%20must%20implement%20interface%20MediaWiki%5CUser%5CUserIdentity%20or%20be%20null,%20boolean%20given,%20called%20in%20/srv/mediawiki/php-1.37.0-wmf.6/includes/upload/UploadFromStash.php%20on%20line%2066%22'))) | Find normalized_message in Logstash ]]
```name=normalized_message
[{reqId}] {exception_url} TypeError: Argument 2 passed to UploadStash::__construct() must implement interface MediaWiki\User\UserIdentity or be null, boolean given, called in /srv/mediawiki/php-1.37.0-wmf.6/includes/upload/UploadFromStash.php on line 66
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.37.0-wmf.6/includes/upload/UploadStash.php(88)
#0 /srv/mediawiki/php-1.37.0-wmf.6/includes/upload/UploadFromStash.php(66): UploadStash->__construct(LocalRepo, boolean)
#1 /srv/mediawiki/php-1.37.0-wmf.6/includes/upload/UploadBase.php(220): UploadFromStash->__construct()
#2 /srv/mediawiki/php-1.37.0-wmf.6/includes/specials/SpecialUpload.php(127): UploadBase::createFromRequest(WebRequest)
#3 /srv/mediawiki/php-1.37.0-wmf.6/includes/specials/SpecialUpload.php(231): SpecialUpload->loadRequest()
#4 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/SpecialPage.php(646): SpecialUpload->execute(NULL)
#5 /srv/mediawiki/php-1.37.0-wmf.6/includes/specialpage/SpecialPageFactory.php(1390): SpecialPage->run(NULL)
#6 /srv/mediawiki/php-1.37.0-wmf.6/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, RequestContext)
#7 /srv/mediawiki/php-1.37.0-wmf.6/includes/MediaWiki.php(917): MediaWiki->performRequest()
#8 /srv/mediawiki/php-1.37.0-wmf.6/includes/MediaWiki.php(551): MediaWiki->main()
#9 /srv/mediawiki/php-1.37.0-wmf.6/index.php(53): MediaWiki->run()
#10 /srv/mediawiki/php-1.37.0-wmf.6/index.php(46): wfIndexMain()
#11 /srv/mediawiki/w/index.php(3): require(string)
#12 {main}
```
==== Impact ====
* Seen about 20 on of these commons in about 5 hours after rolling forward
* Seems like this was introduced with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/688369 (adding @Pchelolo )
== Notes ====