ApiMobileViews logs an error:
```
/w/api.php ErrorException from line 131 of /srv/mediawiki/php-1.30.0-wmf.1/extensions/MobileFrontend/includes/api/ApiMobileView.php: PHP Error: Argument 1 passed to ApiResult::setArrayType() must be an instance of array, null given```
Stack trace:
```
#0 /srv/mediawiki/php-1.30.0-wmf.1/includes/api/ApiResult.php(738): MWExceptionHandler::handleError(integer, string, string, integer, array, array)
#1 /srv/mediawiki/php-1.30.0-wmf.1/extensions/MobileFrontend/includes/api/ApiMobileView.php(131): ApiResult::setArrayType(NULL, string)
#2 /srv/mediawiki/php-1.30.0-wmf.1/includes/api/ApiMain.php(1578): ApiMobileView->execute()
#3 /srv/mediawiki/php-1.30.0-wmf.1/includes/api/ApiMain.php(545): ApiMain->executeAction()
#4 /srv/mediawiki/php-1.30.0-wmf.1/includes/api/ApiMain.php(516): ApiMain->executeActionWithErrorHandling()
#5 /srv/mediawiki/php-1.30.0-wmf.1/api.php(83): ApiMain->execute()
#6 /srv/mediawiki/w/api.php(3): include(string)
#7 {main}
```
Logs: https://logstash.wikimedia.org/app/kibana#/dashboard/Reading-Web?_g=(refreshInterval:(display:Off,pause:!f,value:0),time:(from:now-30d,mode:quick,to:now))&_a=(filters:!(),options:(darkTheme:!f),panels:!((col:1,id:All-Events,panelIndex:1,row:1,size_x:6,size_y:2,type:visualization),(col:7,id:Top-20-Hosts,panelIndex:4,row:1,size_x:3,size_y:2,type:visualization),(col:10,id:MediaWiki-Versions,panelIndex:5,row:1,size_x:3,size_y:2,type:visualization),(col:1,id:'Trending-Messages-(Reduced-noice)',panelIndex:6,row:3,size_x:12,size_y:6,type:visualization),(col:1,columns:!(type,level,wiki,host,message),id:Default-Events-List,panelIndex:7,row:9,size_x:12,size_y:5,sort:!('@timestamp',desc),type:search)),query:(query_string:(analyze_wildcard:!t,query:'message:MobileFrontend%20%20AND%20exception.message:%20%22PHP%20Error:%20Argument%201%20passed%20to%20ApiResult::setArrayType()%20must%20be%20an%20instance%20of%20array,%20null%20given%22')),title:'Reading%20Web',uiState:(P-1:(spy:(mode:(fill:!f,name:!n))),P-4:(vis:(params:(sort:(columnIndex:!n,direction:!n)))),P-6:(vis:(params:(sort:(columnIndex:!n,direction:!n))))))