Uhh, okay, so I didn't really do anything. I tried testing the same thing again with bpammo and it works. I literally touched nothing after the last time I tested with both ammo and bpammo and getting the error thrown. Maybe I ha a massive brain fart and forgot a few things, but for now, there is no error reported.
Quite extraordinary, I'll test it out more and see if it randomly happens, by any chance.
And yes, it even works with every other plugin disabled.