问[V2TIMManager removeSimpleMsgListener:] 偶发崩溃，什么原因？

*** First throw call stack:

(

0 CoreFoundation 0x00007fff23e39f0e __exceptionPreprocess + 350

1 libobjc.A.dylib 0x00007fff50ad79b2 objc_exception_throw + 48

2 CoreFoundation 0x00007fff23e36e10 +[__NSFastEnumerationEnumerator allocWithZone:] + 0

3 ImSDK 0x000000010f82f024 -[V2TIMManager removeSimpleMsgListener:] + 288

4 娃哈哈康有利 0x000000010cf94213 -[WMIMManager wm_prepareToDealloc] + 115

5 娃哈哈康有利 0x000000010cfb5880 -[WMLivePlayViewController dealloc] + 144

6 libobjc.A.dylib 0x00007fff50aef077 _ZN19AutoreleasePoolPage12releaseUntilEPP11objc_object + 147

7 libobjc.A.dylib 0x00007fff50aeef96 objc_autoreleasePoolPop + 199

8 CoreFoundation 0x00007fff23e5b016 _CFAutoreleasePoolPop + 22

9 CoreFoundation 0x00007fff23d985e1 __CFRunLoopRun + 2049

10 CoreFoundation 0x00007fff23d97ac4 CFRunLoopRunSpecific + 404

11 GraphicsServices 0x00007fff38b2fc1a GSEventRunModal + 139

12 UIKitCore 0x00007fff48bc7f80 UIApplicationMain + 1605

13 娃哈哈康有利 0x000000010caffb4a main + 122

14 libdyld.dylib 0x00007fff519521fd start + 1