My app is rejected with Exception EXC_BREAKPOINT (SIGTRAP) - ios

Question

I tested my app on iPhone and iPad devices and it works fine, also I tested it on iOS 10.1.1 and on IPV6 network and it also works fine but after uploading my app to the app store, it is rejected because it crashes when login if the device is offline or on Wifi. They gave me a crash report and after I symplocited it, I get thhis Info :
Date/Time: 2016-11-01 10:07:03.2150 -0700
Launch Time: 2016-11-01 10:05:21.7124 -0700
OS Version: iPhone OS 10.1 (14B72)
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001000f18c0
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 MyApp -[FIRMessagingSecureSocket closeStream:] (in MyApp) + 56
1 MyApp -[FIRMessagingRmq2PersistentStore openDatabase:] (in MyApp) + 228
2 MyApp -[FIRMessagingReceiver didSendDataMessageWithID:] (in MyApp) + 128
3 Foundation 0x00000001835e08f8
4 CoreFoundation 0x0000000182aa48f4
5 CoreFoundation 0x0000000182aa4608
6 CoreFoundation 0x0000000182aa3ec4
7 CoreFoundation 0x0000000182aa1ac0
8 CoreFoundation 0x00000001829d0048
9 GraphicsServices 0x0000000184456198
10 UIKit 0x00000001889b42fc
11 UIKit 0x00000001889af034
12 MyApp -[FIRMessagingClient tryToConnect] (in MyApp) + 212
13 libdyld.dylib 0x00000001819b45b8
update :
I published new version put also get this crash log
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001000a1658
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread: 0
Filtered syslog:
None found
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 MyApp [FIRAMeasurement setUserAttributeOnWorkerQueue:] (in MyApp) + 580
1 MyApp [FIRAMeasurement uploadData] (MyApp) + 180 0x100054000 + 303808
2 MyApp [FIRAMeasurement reportOSUpdateOnWorkerQueue] (in PetCasa Vet) + 124
3 Foundation 0x0000000187acc8f8 0x1879c1000 + 1095928
4 CoreFoundation 0x0000000186f908f4 0x186eb3000 + 907508
5 CoreFoundation 0x0000000186f90608 0x186eb3000 + 906760
6 CoreFoundation 0x0000000186f8fec4 0x186eb3000 + 904900
7 CoreFoundation 0x0000000186f8dac0 0x186eb3000 + 895680
8 CoreFoundation 0x0000000186ebc048 0x186eb3000 + 36936
9 GraphicsServices 0x0000000188942198 0x188936000 + 49560
10 UIKit 0x000000018cea02fc 0x18ce25000 + 504572
11 UIKit 0x000000018ce9b034 0x18ce25000 + 483380
12 MyApp 0x00000001000907d8 (in MyApp) + 448
13 libdyld.dylib 0x0000000185ea05b8 0x185e9c000 + 17848
and this log crash :
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001000e5658
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread: 0
Filtered syslog:
None found
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 MyApp 0x00000001000e5658 (in MyApp) + 1060
1 MyApp [FIRMessagingConnection loginRequestWithToken:authID:] (in MyApp) + 300
2 MyApp [FIRMessagingConnection initWithAuthID:token:host:port:runLoop:rmq2Manager:gcmManager:] (in MyApp) + 32
3 Foundation 0x0000000187acc8f8 0x1879c1000 + 1095928
4 CoreFoundation 0x0000000186f908f4 0x186eb3000 + 907508
5 CoreFoundation 0x0000000186f90608 0x186eb3000 + 906760
6 CoreFoundation 0x0000000186f8fec4 0x186eb3000 + 904900
7 CoreFoundation 0x0000000186f8dac0 0x186eb3000 + 895680
8 CoreFoundation 0x0000000186ebc048 0x186eb3000 + 36936
9 GraphicsServices 0x0000000188942198 0x188936000 + 49560
10 UIKit 0x000000018cea02fc 0x18ce25000 + 504572
11 UIKit 0x000000018ce9b034 0x18ce25000 + 483380
12 MyApp [FIRInstanceIDRegistrationClient parseToken:authToken:withRequestID:handler:] (in MyApp) + 564
13 libdyld.dylib 0x0000000185ea05b8 0x185e9c000 + 17848

Answer 1

From apple documentation
Trace Trap [EXC_BREAKPOINT // SIGTRAP]
......
......
Swift code will terminate with this exception type if an unexpected
condition is encountered at runtime such as:
1- a non-optional type with a nil
2- value a failed forced type conversion
In my app I use location and I send it to backend, and it works fine, but when opening app at first time, system show alert to say that my app want to use your location allow or not allow, if user didn't allow so location methods will not work and location will be nil and unfortunately I didn't check if location is nil so when unwrap it app crashed, it's my mistake.

Answer 2

Please send message to the Apple review team about same and ask to them
"We tested application on iPhone 6, 6s, 7 and 7+ with iOS 10.x and application works perfect in IPV6 network, We follow following process for IPV6 network: http://www.brianjcoleman.com/tutorial-how-to-test-your-app-for-ipv6-compatibility/" and request to them your event will be held on the coming week so, please release application to store asap and let me know the flow of the application, where you find issue or crashes.
It works, I had done same thing with 4 application and they approved.