==== Error ====
* mwversion: `1.38.0-wmf.12`
* reqId: `dd64d044-234a-4520-b7e5-3087e2bb73ea`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-12-14T19:57:23.000Z',to:'2021-12-15T20:32:29.576Z'))&_a=(query:(query_string:(query:'reqId:%22dd64d044-234a-4520-b7e5-3087e2bb73ea%22'))) | Find reqId in Logstash ]]
```name=normalized_message
[{reqId}] {exception_url} PHP Notice: Array to string conversion
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.38.0-wmf.12/includes/TemplateParser.php(168) : eval()'d code(33)
#0 /srv/mediawiki/php-1.38.0-wmf.12/includes/TemplateParser.php(168) : eval()'d code(33): MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/php-1.38.0-wmf.12/vendor/zordius/lightncandy/src/Runtime.php(413): TemplateParser->{closure}(array, array)
#2 /srv/mediawiki/php-1.38.0-wmf.12/includes/TemplateParser.php(168) : eval()'d code(34): LightnCandy\Runtime::sec(array, array, NULL, array, boolean, Closure)
#3 /srv/mediawiki/php-1.38.0-wmf.12/includes/TemplateParser.php(286): TemplateParser->{closure}(array, array)
#4 /srv/mediawiki/php-1.38.0-wmf.12/extensions/MediaSearch/src/Special/SpecialMediaSearch.php(280): TemplateParser->processTemplate(string, array)
#5 /srv/mediawiki/php-1.38.0-wmf.12/includes/specialpage/SpecialPage.php(647): MediaWiki\Extension\MediaSearch\Special\SpecialMediaSearch->execute(NULL)
#6 /srv/mediawiki/php-1.38.0-wmf.12/includes/specialpage/SpecialPageFactory.php(1377): SpecialPage->run(NULL)
#7 /srv/mediawiki/php-1.38.0-wmf.12/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, RequestContext)
#8 /srv/mediawiki/php-1.38.0-wmf.12/includes/MediaWiki.php(903): MediaWiki->performRequest()
#9 /srv/mediawiki/php-1.38.0-wmf.12/includes/MediaWiki.php(563): MediaWiki->main()
#10 /srv/mediawiki/php-1.38.0-wmf.12/index.php(53): MediaWiki->run()
#11 /srv/mediawiki/php-1.38.0-wmf.12/index.php(46): wfIndexMain()
#12 /srv/mediawiki/w/index.php(3): require(string)
#13 {main}
```
==== Impact ====
The trace is redacted for some reason but refers to `extensions/MediaSearch`. Some template processing result in `PHP Notice: Array to string conversion`.
==== Notes ====