An error is frequently occurring in logstash. It might be exposing a bug that we are not aware of, and is making it harder to see other bugs in our error logs so we should aim to investigate it and squash it!
Uncommon
[[ https://logstash.wikimedia.org/app/kibana#/discover?_g=(refreshInterval:(display:Off,pause:!f,value:0),time:(from:now%2FM,mode:quick,to:now%2FM))&_a=(columns:!(_source),index:'logstash-*',interval:auto,query:(query_string:(analyze_wildcard:!t,query:'message:%22SkinMinerva.php:%20Call%20to%20a%20member%20function%20getTimestamp()%20on%20a%20non-object%20(boolean)%22')),sort:!('@timestamp',desc)) | Live errors ]]
Stack trace:
```
/srv/mediawiki/php-1.29.0-wmf.16/extensions/MobileFrontend/includes/skins/SkinMinerva.php(91): SkinMinerva->prepareUserButton(MinervaTemplate)
#1 /srv/mediawiki/php-1.29.0-wmf.16/includes/skins/SkinTemplate.php(249): SkinMinerva->prepareQuickTemplate()
#2 /srv/mediawiki/php-1.29.0-wmf.16/includes/OutputPage.php(2400): SkinTemplate->outputPage()
#3 /srv/mediawiki/php-1.29.0-wmf.16/includes/MediaWiki.php(867): OutputPage->output(boolean)
#4 /srv/mediawiki/php-1.29.0-wmf.16/includes/MediaWiki.php(879): Closure$MediaWiki::main()
#5 /srv/mediawiki/php-1.29.0-wmf.16/includes/MediaWiki.php(521): MediaWiki->main()
#6 /srv/mediawiki/php-1.29.0-wmf.16/index.php(43): MediaWiki->run()
#7 /srv/mediawiki/w/index.php(3): include(string)
#8 {main}
```
Along with T151838 this contributes for the majority of our noise in our error logs so it would be good to make it go away.