Crash at NSOperationQueue addOperation Custom NSOperation -

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i have nsoperationqueue, maxconcurrentoperationcount = 1,

and custom nsoperation has property block,

when nsoperationqueue addoperation, app crash, in ios 9.x,

the nsoperation not nil.

following apple crash report, can't reappear:

exception type:  exc_bad_access (sigsegv) exception subtype: kern_invalid_address @ 0x1000000013ed199e  0   foundation 0x0000000182f3b4e8 ____addoperations_block_invoke607 + 524 (nsoperation.m:193) 1   foundation 0x0000000182f3b488 ____addoperations_block_invoke607 + 428 (nsoperation.m:204) 2   foundation 0x0000000182f26170 -[nsobject(nskeyvalueobservingprivate) _changevalueforkeys:count:maybeoldvaluesdict:usingblock:] + 672 (nskeyvalueobserving.m:2406) 3   foundation 0x0000000182e7afc0 -[nsobject(nskeyvalueobservingprivate) _changevalueforkey:key:key:usingblock:] + 64 (nskeyvalueobserving.m:2432) 4   foundation 0x0000000182f392e4 __addoperations + 1400 (nsoperation.m:2100)

thanks!


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