I get the following when I visit Commons (user_talk history) and reload a page on my mobile.
Running Chrome 53
- Ensure $wgAllowUserJs = true; in LocalSettings.php
- Visit your minerva.js page e.g. http://localhost:8888/w/index.php/User:Jdlrobson/minerva.js
- Edit it to add console.log('hello');
- Refresh page
- Inspect console
If you delete the page the error disappears