Exception: Array mutated while being enumerated. What array is it talking about?

Question

I've been bumping my head against the good old,

***Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x14d5e120> was mutated while being enumerated.

I've had to contend with this a couple of times before and usually it's fairly easy to identify where the offending code is. Only in this current case, I've checked everywhere in my code and can't find which array it is talking about.

So my question is is there any tool or debugger command I can use to help me pinpoint where in my code this thing is blowing up? I see the address of the array, but I don't know how to resolve this into a location in the code, if that's even possible at all.