Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000c0000001c
VM Region Info: 0xc0000001c is not in any region.  Bytes after previous region: 40265318429  
      REGION TYPE                      START - END             [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      MALLOC_NANO            0000000280000000-00000002a0000000 [512.0M] rw-/rwx SM=PRV  
--->  
      UNUSED SPACE AT END

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [4046]
Triggered by Thread:  0

Thread 0 name:
Thread 0 Crashed:
0   libobjc.A.dylib               	0x000000019a475500 object_isClass + 16 (objc-runtime-new.h:340)
1   Foundation                    	0x000000019ab29434 KVO_IS_RETAINING_ALL_OBSERVERS_OF_THIS_OBJECT_IF_IT_CRASHES_AN_OBSERVER_WAS_OVERRELEASED_OR_SMASHED + 48 (NSKeyValueObserving.m:1120)
2   Foundation                    	0x000000019ab26e74 NSKeyValueWillChangeWithPerThreadPendingNotifications + 276 (NSKeyValueObserving.m:1151)
3   Foundation                    	0x000000019aabe810 -[NSObject(NSKeyValueObserverNotification) willChange:valuesAtIndexes:forKey:] + 64 (NSKeyValueObserving.m:2061)
4   Foundation                    	0x000000019ac016c0 -[NSKeyValueNotifyingMutableOrderedSet insertObject:atIndex:] + 112 (NSKeyValueMutableOrderedSet.m:923)
5   iSH                           	0x00000001020cfb20 __59-[Roots importRootFromArchive:name:error:progressReporter:]_block_invoke + 68 (Roots.m:155)
6   libdispatch.dylib             	0x000000019a4035ac _dispatch_client_callout + 20 (object.m:495)
7   libdispatch.dylib             	0x000000019a41043c _dispatch_async_and_wait_invoke + 96 (queue.c:1536)
8   libdispatch.dylib             	0x000000019a4035ac _dispatch_client_callout + 20 (object.m:495)
9   libdispatch.dylib             	0x000000019a40f7d4 _dispatch_main_queue_callback_4CF + 832 (inline_internal.h:2484)
10  CoreFoundation                	0x000000019a6dc8d4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 (CFRunLoop.c:1749)
11  CoreFoundation                	0x000000019a6d758c __CFRunLoopRun + 1692 (CFRunLoop.c:3069)
12  CoreFoundation                	0x000000019a6d6bc8 CFRunLoopRunSpecific + 480 (CFRunLoop.c:3192)
13  GraphicsServices              	0x00000001a4abf5cc GSEventRunModal + 164 (GSEvent.c:2246)
14  UIKitCore                     	0x000000019e889744 UIApplicationMain + 1936 (UIApplication.m:4823)
15  iSH                           	0x00000001020d59b0 main + 104880 (main.m:13)
16  libdyld.dylib                 	0x000000019a553384 start + 4