Crashed: com.apple.root.default-qos
0 libsystem_pthread.dylib 0x1824706bc pthread_mutex_lock$VARIANT$mp + 278
1 CoreFoundation 0x18270ba34 CFRunLoopSourceSignal + 68
2 Foundation 0x1831d6c90 performQueueDequeue + 468
3 Foundation 0x183292020 __NSThreadPerformPerform + 136
4 CoreFoundation 0x1827ef404 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
5 CoreFoundation 0x1827eece0 __CFRunLoopDoSources0 + 456
6 CoreFoundation 0x1827ec79c __CFRunLoopRun + 1204
7 CoreFoundation 0x18270cda8 CFRunLoopRunSpecific + 552
8 Foundation 0x183181674 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
9 xxxx 0x101ce5b44 -[AVObject sendBatchRequest:eventually:error:] + 4290372
10 xxxx 0x101ce3e34 -[AVObject saveWithOption:eventually:verifyBefore:error:] + 4282932
11 xxxx 0x101ce46d4 __56-[AVObject saveInBackgroundWithOption:eventually:block:]_block_invoke + 4285140
12 libdispatch.dylib 0x182138aa0 _dispatch_call_block_and_release + 24
13 libdispatch.dylib 0x182138a60 _dispatch_client_callout + 16
14 libdispatch.dylib 0x18213fb84 _dispatch_queue_override_invoke$VARIANT$mp + 716
15 libdispatch.dylib 0x182145cac _dispatch_root_queue_drain + 588
16 libdispatch.dylib 0x1821459fc _dispatch_worker_thread3 + 120
17 libsystem_pthread.dylib 0x18246bfac _pthread_wqthread + 1176
18 libsystem_pthread.dylib 0x18246bb08 start_wqthread + 4