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I have an app which is Live on Appstore and has several daily active users. Recently a user reported consistent crash at random sports on his device. By reviewing Crashlytics, I found out that the crash is being produced on iPhone XS Max with iOS 13.2 and the stack trace has following information:Crashed: com.apple.main-thread 0 libsystem_platform.dylib 0x1b3bdbf64 os_unfair_lock_lock + 16 1 CoreFoundation 0x1b3da9bc4 -[__NSDictionaryM dealloc] + 76 2 ??? 0x1c1ba981b3c0a400 (Missing) 3 ??? 0x0 (Missing) 4 ??? 0x0 (Missing) 5 ??? 0x2766d381b3c0a400 (Missing) 6 ??? 0x3d5f6c01b3e1b600 (Missing) 7 ??? 0xd271c81b3da6180 (Missing) 8 ??? 0x3542181b3c0a400 (Missing) 9 ??? 0x0 (Missing) 10 ??? 0x2d16ca81b3da9c00 (Missing) 11 ??? 0x0 (Missing) 12 ??? 0x7e19e401b3afac00 (Missing) 13 ??? 0x7f368801b3b7d000 (Missing) 14 ??? 0x5b22a781b3b88c00 (Missing) 15 ??? 0x0 (Missing) 16 ??? 0x3d0fc001b3e4bc00 (Missing) 17 ??? 0x56480c81b3e4b000 (Missing) 18 ??? 0x0 (Missing) 19 ??? 0x192a7901b7f6b800 (Missing) 20 ??? 0x254f2401008b0200 (Missing) 21 libdyld.dylib 0x1b3ccaf30 start + 4This is not a lot of information, but this is what I am getting through crashlytics. I have several devices including iphone 6, 6s and X, but unable to reproduce similar crash.Can anyone suggest what could be the possible issue here?