* 645715 errors in last 24hrs
* https://logstash.wikimedia.org/goto/37116848c348f3fb19e0cb9f961157fe
* All on mobile
{F59622880, size=full}
**Steps to replicate the issue** (include links if applicable):
* Visit https://es.m.wikipedia.org/wiki/Thunderbolts*#/languages in incognito window
* Open language overlay
```
at getMissingFrequentLanguages https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cx.entrypoints.mffrequentlanguages&skin=minerva&version=dcdhh:3:460
at eval https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cx.entrypoints.mffrequentlanguages&skin=minerva&version=dcdhh:4:218
at Object.fire https://en.m.wikipedia.org/w/load.php?lang=en&modules=mediawiki.base&skin=minerva&version=194e7:4:754
at onOpen https://en.m.wikipedia.org/w/load.php?lang=en&modules=mobile.startup&skin=minerva&version=ey43c:4:3527
at eval https://en.m.wikipedia.org/w/load.php?lang=en&modules=mobile.languages.structured&skin=minerva&version=hjfdw:1:1441
```
**What happens?**:
Error in JS console
**What should have happened instead?**:
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):