崩溃在NSOperationQueue addOperation Custom NSOperation

Question

我有一个NSOperationQueue,maxConcurrentOperationCount = 1,

和自定义NSOperation有一个属性是块,

当iOS 9.x中的NSOperationQueue addOperation,应用程序崩溃时,

NSOperation不是零.

以下是Apple崩溃报告,但我不能再出现:

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 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)

谢谢!