Error interacting with the map in the simulator - swift

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There is an error:
2017-09-13 11:21:04.405 Seer[1413:69626] *** Terminating app due to
uncaught exception 'GMSThreadException', reason: 'The API method must
be called from the main thread'
*** First throw call stack:
(
0 CoreFoundation 0x000000010bb30b0b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010aef2141 objc_exception_throw + 48
2 CoreFoundation 0x000000010bb99625 +[NSException raise:format:] + 197
3 Seer 0x0000000104638ed2 -[GMSMapView clear] + 97
4 Seer 0x000000010461a4ff _TFC4Seer14ViewController12markercreatefT_T_ + 159
5 Seer 0x000000010461950f _TFFC4Seer14ViewController9outputphpFT_T_U_FTGSqV10Foundation4Data_GSqCSo11URLResponse_GSqPs5Error___T_ + 2927
6 Seer 0x00000001046178db _TTRXFo_oGSqV10Foundation4Data_oGSqCSo11URLResponse_oGSqPs5Error____XFdCb_dGSqCSo6NSData_dGSqS1__dGSqCSo7NSError___ + 203
7 CFNetwork 0x000000010b3bd87b __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 19
8 CFNetwork 0x000000010b3bd095 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 143
9 Foundation 0x000000010a9fc3b7 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
10 Foundation 0x000000010a9fc0bb -[NSBlockOperation main] + 101
11 Foundation 0x000000010a9fa877 -[__NSOperationInternal _start:] + 627
12 Foundation 0x000000010a9f65fc __NSOQSchedule_f + 198
13 libdispatch.dylib 0x000000010caa905c _dispatch_client_callout + 8
14 libdispatch.dylib 0x000000010ca8794f _dispatch_queue_serial_drain + 221
15 libdispatch.dylib 0x000000010ca88669 _dispatch_queue_invoke + 1084
16 libdispatch.dylib 0x000000010ca8aec4 _dispatch_root_queue_drain + 634
17 libdispatch.dylib 0x000000010ca8abef _dispatch_worker_thread3 + 123
18 libsystem_pthread.dylib 0x000000010ce405a2 _pthread_wqthread + 1299
19 libsystem_pthread.dylib 0x000000010ce4007d start_wqthread + 13
)
libc++abi.dylib: terminating with uncaught exception of type
NSException
(lldb)
in the simulator when interacting with the map, for example when creating markers:
let marker = GMSMarker()
marker.position = CLLocationCoordinate2D(latitude: catlatlon[index][1], longitude: catlatlon[index][2])
marker.title = "Муляж Камеры | ID: \(Int(catlatlon[index][3]))"
marker.snippet = "Дата: \(catstring[index])"
marker.icon = self.imageWithImage(image: #imageLiteral(resourceName: "ic_fake.png"), scaledToSize: CGSize(width: 28.0, height: 48.0)) // муляж камеры
marker.map = self.mMap
But on a real device everything works well.
I would leave it as it is. But I'm afraid when testing the application by moderators the AppStore, will show this error and they will not publish my application