I declared it a Heisenbug!

So, basically I was starting multiple threads...
I was getting a list index out of range on line 268 which was a dict. Strange.
36 hours later, a lot of changes, I was still having the same error whatever I put on line 268, log, try, but when I got it on a comment... I lost it.
Restarted Pycharm.
Reset the branch to remote.
Everything worked fine.
Fuuuuuuuuuuu