more info Firebase Crashlytics Fatal Exception: NSGenericException 0 CoreFoundation 0x11a21c __exceptionPreprocess 1 libobjc.A.dylib 0x31abc objc_exception_throw 2 CoreFoundation 0x178a54 -[__NSSingleObjectEnumerator init] 3 RoomScanCore 0x7f760 (Missing UUID 2e777814968a3d2a99c57684bc5f1059) 4 RoomScanCore 0xf46fc (Missing UUID 2e777814968a3d2a99c57684bc5f1059) 5 RoomScanCore 0x1ae790 (Missing UUID 2e777814968a3d2a99c57684bc5f1059) 6 RoomScanCore 0x1abe94 (Missing UUID 2e777814968a3d2a99c57684bc5f1059) 7 RoomScanCore 0xe1758 (Missing UUID 2e777814968a3d2a99c57684bc5f1059) 8 libdispatch.dylib 0x1aac _dispatch_call_block_and_release 9 libdispatch.dylib 0x1b584 _dispatch_client_callout 10 libdispatch.dylib 0xa2d0 _dispatch_lane_serial_drain 11 libdispatch.dylib 0xadac _dispatch_lane_invoke 12 libdispatch.dylib 0x151dc _dispatch_root_queue_drain_deferred_wlh 13 libdispatch.dylib 0x14a60 _dispatch_workloop_worker_thread 14 libsystem_pthread.dylib 0xa0c _pthread_wqthread 15 libsystem_pthread.dylib 0xaac start_wqthread