Unlikely anything official would be linking to tools.wmflabs.org. Probably a local gadget. What wiki is this?

@Greenrd: Please always provide steps to reproduce the problem. Also see https://www.mediawiki.org/wiki/How_to_report_a_bug - thank you!

I don't understand why you put such onerous requirements on volunteers. It's a hosted webapp. Developers can do anything so you can just log in as me and see what I see, surely. And if you can't see it, you can just ask me questions. Anyway, I just thought I'd help you by notifying you of this problem, but if my help is unwanted, please close this task.

@Greenrd: Your help is wanted. We can't see the problem as we need clearer steps to reproduce and that is exactly why we ask questions, in this case: What wiki is this? / Please provide a link where exactly the problem can be seen by others.
Thanks for your help!

Looks like https://en.wikipedia.org/wiki/MediaWiki:Gadget-citations.js

So https://en.wikipedia.org/wiki/MediaWiki:Gadget-citations seems to be the info place. Users in charge of this tool are Smith609, Mattsenate, and Maximilianklein

Based on error.log, this is an error in the actual code, so the tool developers (mattsenate, maximilianklein and smith609) will have to take a look at it.

2015-08-01 21:19:04: (mod_fastcgi.c.2673) FastCGI-stderr: PHP Fatal error:  Call to undefined function revisionID() in /data/project/citations/public_html/text.php on line 28
2015-08-01 21:19:04: (mod_fastcgi.c.2673) FastCGI-stderr: PHP Stack trace:
2015-08-01 21:19:04: (mod_fastcgi.c.2673) FastCGI-stderr: PHP   1. {main}() /data/project/citations/public_html/text.php:0

In T107649#1500892, @Greenrd wrote:

Developers can do anything so you can just log in as me and see what I see, surely.

Not "just", no. If that was easy and non-hacky it'd be some sort of deployment/restricted type thing and @Aklapper doesn't have that kind of access.