macOS Sierra: Crash "NSDictionary was mutated while being enumerated."

Originator:manuel
Number:rdar://26890378 Date Originated:2016-06-20
Status:Open Resolved:
Product:macOS Product Version:10.12 Beta (16A201w)
Classification:Crash/Hang/Data Loss Reproducible:I didn't Try
 
Exception Name: NSGenericException
Description: *** Collection <__NSCFDictionary: 0x608000478b40> was mutated while being enumerated.
User Info: (null)

0   CoreFoundation                      0x00007fffbc9d35db __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x00007fffd018ea2d objc_exception_throw + 48
2   CoreFoundation                      0x00007fffbca4bdb6 __NSFastEnumerationMutationHandler + 294
3   CoreFoundation                      0x00007fffbc965b39 -[NSDictionary getObjects:andKeys:count:] + 233
4   CoreFoundation                      0x00007fffbc94b803 -[NSDictionary allValues] + 179
5   IMCore                              0x00007fffca2a96ed IMCore + 108269
6   IMCore                              0x00007fffca2ad5f1 IMCore + 124401
7   Foundation                          0x00007fffbe3888a1 __NSFireDelayedPerform + 410
8   CoreFoundation                      0x00007fffbc953364 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
9   CoreFoundation                      0x00007fffbc952fef __CFRunLoopDoTimer + 1071
10  CoreFoundation                      0x00007fffbc952b4a __CFRunLoopDoTimers + 298
11  CoreFoundation                      0x00007fffbc94a341 __CFRunLoopRun + 2065
12  CoreFoundation                      0x00007fffbc9498cd CFRunLoopRunSpecific + 285
13  HIToolbox                           0x00007fffbbf1e27c RunCurrentEventLoopInMode + 240
14  HIToolbox                           0x00007fffbbf1e0b1 ReceiveNextEventCommon + 432
15  HIToolbox                           0x00007fffbbf1dee6 _BlockUntilNextEventMatchingListInModeWithFilter + 71
16  AppKit                              0x00007fffba68d101 _DPSNextEvent + 1093
17  AppKit                              0x00007fffbad92a0c -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 670
18  AppKit                              0x00007fffba681a3e -[NSApplication run] + 929
19  AppKit                              0x00007fffba64d367 NSApplicationMain + 1237
20  Messages                            0x00000001092546be main + 1706
21  libdyld.dylib                       0x00007fffd0a68285 start + 1
22  ???                                 0x0000000000000002 0x0 + 2

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