That would make a degree of sense.
What doesn't make sense is that it's still causing an exception after I had it check for nulls before dereferencing in _all_ the sort delegates in that... oh, I get it now. The meat of the work happens in the functions called by the delegates, and they're erroring out.
I know how to fix it now, I think, though it would still be good if you could test it with the CoN-off thing.