Error 500 for trackr.moe

[ThePunkdog]

Bug report

Delete this section if not applicable

What is the bug?
Error 500 in attempting to visit trackr.moe & when attempting to mark chapters as read (on any website)
Please provide steps to reproduce:
As above
Where did the bug happen? (If applicable)
The entire website/script

[DakuTree]

Quick look at the logs and it seems like MySQL is having issues. Can't investigate as I'm currently at work though.
I've restarted the server and the site appears to be working fine now? Will have a bit more of a look later on today as it's possible the problem will appear again.