==== Error ====
* mwversion: `1.37.0-wmf.5`
* reqId: `589e3a27-06b5-4e3b-9078-df0812e7c33b`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-05-12T21:35:06.000Z',to:'2021-05-13T21:35:44.935Z'))&_a=(query:(query_string:(query:'reqId:%22589e3a27-06b5-4e3b-9078-df0812e7c33b%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%20PHP%20Notice:%20Undefined%20variable:%20pageName%22'))) | Find normalized_message in Logstash ]]
```name=normalized_message
[{reqId}] {exception_url} PHP Notice: Undefined variable: pageName
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.37.0-wmf.5/includes/logging/LogEventsList.php(770)
#0 /srv/mediawiki/php-1.37.0-wmf.5/includes/logging/LogEventsList.php(770): MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/php-1.37.0-wmf.5/extensions/CentralAuth/includes/specials/SpecialMultiLock.php(520): LogEventsList::showLogExtract(string, array, string, string, array)
#2 /srv/mediawiki/php-1.37.0-wmf.5/extensions/CentralAuth/includes/specials/SpecialMultiLock.php(106): SpecialMultiLock->showLogExtract()
#3 /srv/mediawiki/php-1.37.0-wmf.5/includes/specialpage/SpecialPage.php(646): SpecialMultiLock->execute(NULL)
#4 /srv/mediawiki/php-1.37.0-wmf.5/includes/specialpage/SpecialPageFactory.php(1396): SpecialPage->run(NULL)
#5 /srv/mediawiki/php-1.37.0-wmf.5/includes/MediaWiki.php(313): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, RequestContext)
#6 /srv/mediawiki/php-1.37.0-wmf.5/includes/MediaWiki.php(916): MediaWiki->performRequest()
#7 /srv/mediawiki/php-1.37.0-wmf.5/includes/MediaWiki.php(550): MediaWiki->main()
#8 /srv/mediawiki/php-1.37.0-wmf.5/index.php(53): MediaWiki->run()
#9 /srv/mediawiki/php-1.37.0-wmf.5/index.php(46): wfIndexMain()
#10 /srv/mediawiki/w/index.php(3): require(string)
#11 {main}
```
==== Notes ====
16 of these in the last hour. This error is now for wmf.5. There are two variants of the same error message, one occurring at LogEventsList:732