Sometimes… no wait, most of the times, your Objective-C application will crash with something like:
Terminating app due to uncaught exception
And proceeding to show you a quite useless series of memory addresses like this:

You could try to inspect those addresses with GDB using:
info symbol <0xaddress>
But the informations you will receive are as useless as the Xcode back trace.
Fear not! Here is the solution: go in the break point navigator and add an exception breakpoint like so:

You’ll be presented with a popover that you can just leave as it is:

And done! Now every exception will trigger a breakpoint exactly where it’s being thrown. This saved me from endless debugging pain, I hope it can come handy to someone else.
Thanks, every little bit helps. Some of the debugging is gibberish…