Crash in MR_privateQueueContextWithStoreCoordinator

[ChenYalun]

Crash Type: EXC_BAD_ACCESS
Thread 0 Crashed:
0 libsystem_kernel.dylib __pthread_kill (in libsystem_kernel.dylib) + 8
1 libsystem_c.dylib abort (in libsystem_c.dylib) + 112
2 libsystem_malloc.dylib _nano_malloc_check_clear (in libsystem_malloc.dylib) + 0
3 libsystem_malloc.dylib _nano_malloc_check_clear (in libsystem_malloc.dylib) + 364
4 libsystem_malloc.dylib nano_calloc (in libsystem_malloc.dylib) + 80
5 libsystem_malloc.dylib malloc_zone_calloc (in libsystem_malloc.dylib) + 124
6 libsystem_malloc.dylib calloc (in libsystem_malloc.dylib) + 64
7 libobjc.A.dylib class_createInstance (in libobjc.A.dylib) + 80
8 libobjc.A.dylib _objc_rootAlloc (in libobjc.A.dylib) + 52
9 CoreData -[NSManagedObjectContext(_NSInternalAdditions) _initWithParentObjectStore:] (in CoreData) + 664
10 CoreData -[NSManagedObjectContext initWithConcurrencyType:] (in CoreData) + 228
11 BoxApp +[NSManagedObjectContext(MagicalRecord) MR_privateQueueContext] (in BaiduBoxApp) (NSManagedObjectContext+MagicalRecord.m:92)
12 BoxApp +[NSManagedObjectContext(MagicalRecord) MR_privateQueueContextWithStoreCoordinator:] (in BaiduBoxApp) (NSManagedObjectContext+MagicalRecord.m:0)
13 BoxApp -[ModelMgr updateObjectPropertyWith:] (in BoxApp) (ModelMgr.m:193)

Maybe because of my version? So, how to fix it?