Crash on iOS reported in Firebase Crashlytics

SDK version: 16.6.1

We’re unable to reproduce this issue, but it seem to occur in Intercom chat.

Here’s the crashlog:

IntercomSDK_saveViewHierarchy

com.apple.main-thread
0  libsystem_kernel.dylib         0x1808 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x5008 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x4f20 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x4d60 mach_msg + 24
4  CoreFoundation                 0x53f5c __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x53600 __CFRunLoopRun + 1208
6  CoreFoundation                 0x52cd8 CFRunLoopRunSpecific + 608
7  GraphicsServices               0x11a8 GSEventRunModal + 164
8  UIKitCore                      0x40a90c -[UIApplication _run] + 888
9  UIKitCore                      0x4be9d0 UIApplicationMain + 340
10 Runner                         0xbf74 main + 12 (AppDelegate.swift:12)
11 ???                            0x1b2aa9e4c (Missing)

com.apple.uikit.eventfetch-thread
0  libsystem_kernel.dylib         0x1808 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x5008 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x4f20 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x4d60 mach_msg + 24
4  CoreFoundation                 0x53f5c __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x53600 __CFRunLoopRun + 1208
6  CoreFoundation                 0x52cd8 CFRunLoopRunSpecific + 608
7  Foundation                     0xc7e4c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8  Foundation                     0xc7c9c -[NSRunLoop(NSRunLoop) runUntilDate:] + 64
9  UIKitCore                      0x41e640 -[UIEventFetcher threadMain] + 420
10 Foundation                     0xde718 __NSThread__start__ + 732
11 libsystem_pthread.dylib        0x606c _pthread_start + 136
12 libsystem_pthread.dylib        0x10d8 thread_start + 8