iOS build crashed (5% reproducibility) with 0x83f62c GlobalXToTRS + 103 (TransformHierarchy.h:103).

 Crashed: com.apple.main-thread
 0  XXXXX                      0x83f62c GlobalXToTRS + 103 (TransformHierarchy.h:103)
 1  XXXXX                      0x83e7b8 IKJob + 1974 (Animator.cpp:1974)
 2  XXXXX                      0x83e094 Job + 24 (BlockRangeJob.h:24)
 3  XXXXX                      0xaebb44 Exec + 559 (JobQueue.cpp:559)
 4  XXXXX                      0xaec7f0 WaitForJobGroupID + 1472 (JobQueue.cpp:1472)
 5  XXXXX                      0xaea4a8 <name omitted> + 17 (Jobs.cpp:17)
 6  XXXXX                      0x83d4c0 UpdateAvatars + 1137 (Animator.cpp:1137)
 7  XXXXX                      0xbacd44 ExecuteProcessCallbacks + 641 (vector:641)
 8  XXXXX                      0xb19b88 ExecutePlayerLoop + 347 (PlayerLoop.cpp:347)
 9  XXXXX                      0xb19bbc ExecutePlayerLoop + 365 (PlayerLoop.cpp:365)
 10 XXXXX                      0xb19d9c PlayerLoop + 45 (RecursionLimit.h:45)
 11 XXXXX                      0xdb4e90 UnityPlayerLoopImpl + 285 (LibEntryPoint.mm:285)
 12 XXXXX                      0xe33c UnityRepaint + 285 (UnityAppController+Rendering.mm:285)
 13 XXXXX                      0xe218 -[UnityAppController(Rendering) repaintDisplayLink] + 72 (UnityAppController+Rendering.mm:72)
 14 QuartzCore                     0x10d90 CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 756
 15 QuartzCore                     0x176dc display_timer_callback(__CFMachPort*, void*, long, void*) + 372
 16 CoreFoundation                 0xb390 __CFMachPortPerform + 176
 17 CoreFoundation                 0x4e724 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION + 60
 18 CoreFoundation                 0x51f30 __CFRunLoopDoSource1 + 596
 19 CoreFoundation                 0xbe0c __CFRunLoopRun + 2380
 20 CoreFoundation                 0x1f3b8 CFRunLoopRunSpecific + 600
 21 GraphicsServices               0x138c GSEventRunModal + 164
 22 UIKitCore                      0x5196a8 -[UIApplication _run] + 1100
 23 UIKitCore                      0x2987f4 UIApplicationMain + 2092
 24 XXXXX                      0x5970 main + 41 (main.mm:41)
 25 ???                            0x107835a24 (Missing)