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Tracker is an app used by Wikimedia Czech Republic to track its expenses.

In its admin interface at production, going to /admin/django_comments/comment throws a fatal error. A sysadmin has determined that the error is reproducable using dump from production database. You can see the traceback and download database dump from attached Phabricator task.

Your task is to identify why prod Tracker behaves that way. If you're able to find the cause, please upload a fixing patch against wikimedia-cz/tracker.

For this task to be considered completed, you do not need to manage to find the root cause. You need to, however, make genuine effort to investigate. Please note steps you did to investigate in the Phabricator task, so others don't need to repeat your work.

Materials

• Tracker in production
• Test Tracker version - you can play with Tracker freely here
• Codebase