This weekend I was working on a fun hobby project with a friend of mine. While he was modeling items for the game I started with a dungeon generator.

This morning I got stuck at a bug which took me more than 12 hours and 4 developers to fix. In the end I found the issue. I was checking

If y > arraySize && somethingElse
DoSomething();

It had to be:
If y < arraySize && somethingElse
DoSomething();

After I changed that everything worked without issues... Day well spent...