+[YYWebImageOperation _networkThreadMain:] crash

[yalong5837]

SIGSEGV:SEGV_ACCERR
0 CoreFoundation ___CFCheckCFInfoPACSignature + 4
1 CoreFoundation _CFRunLoopSourceSignal + 28
2 Foundation _performQueueDequeue + 484
3 Foundation ___NSThreadPerformPerform + 88
4 CoreFoundation _CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28
5 CoreFoundation ___CFRunLoopDoSource0 + 172
6 CoreFoundation ___CFRunLoopDoSources0 + 332
7 CoreFoundation ___CFRunLoopRun + 840
8 CoreFoundation _CFRunLoopRunSpecific + 572
9 Foundation -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
10 Foundation -[NSRunLoop(NSRunLoop) run] + 64

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