Thread 11 Crashed:
0   libsystem_kernel.dylib               0x00007fffab4d1dda __pthread_kill + 10
1   libsystem_c.dylib                    0x00007fffab437440 abort + 129
2   CrashReporter                        0x000000010f28d851 uncaught_exception_handler (PLCrashReporter.m:365)
3   CoreFoundation                       0x00007fff963d7e29 __handleUncaughtException + 745
4   libobjc.A.dylib                      0x00007fffaaac9b85 _ZL15_objc_terminatev + 94
5   libc++abi.dylib                      0x00007fffa9fbdd69 _ZSt11__terminatePFvvE + 8
6   libc++abi.dylib                      0x00007fffa9fbdde3 _ZSt9terminatev + 51
7   libobjc.A.dylib                      0x00007fffaaac998e objc_terminate + 9
8   libdispatch.dylib                    0x00007fffab36d13c _dispatch_client_callout + 28
9   libdispatch.dylib                --->0x00007fffab36dd62 _dispatch_barrier_sync_f_invoke + 83
10  Snagit                               0x000000010e1a5d68 -[AFURLSessionManager dataTaskWithRequest:completionHandler:] (AFURLSessionManager.m:664)
11  Snagit                               0x000000010e19083e -[AFHTTPSessionManager dataTaskWithHTTPMethod:URLString:parameters:success:failure:] (AFHTTPSessionManager.m:243)
12  Snagit                               0x000000010e18fb0d -[AFHTTPSessionManager GET:parameters:success:failure:] (AFHTTPSessionManager.m:112)
13  Snagit                               0x000000010e1d2f29 __51-[TSCAccountHTTPSession GET:parameters:completion:]_block_invoke (TSCAccountHTTPSession.m:317)
14  Snagit                               0x000000010e1d464f __58-[TSCAccountHTTPSession performNetworkRequest:completion:]_block_invoke_2 (TSCAccountHTTPSession.m:495)
15  libdispatch.dylib                    0x00007fffab375f5f _dispatch_call_block_and_release + 12
16  libdispatch.dylib                    0x00007fffab36d128 _dispatch_client_callout + 8
17  libdispatch.dylib                    0x00007fffab37c2ce _dispatch_queue_override_invoke + 743
18  libdispatch.dylib                    0x00007fffab36eee0 _dispatch_root_queue_drain + 476
19  libdispatch.dylib                    0x00007fffab36ecb7 _dispatch_worker_thread3 + 99
20  libsystem_pthread.dylib              0x00007fffab5b9746 _pthread_wqthread + 1299
21  libsystem_pthread.dylib              0x00007fffab5b9221 start_wqthread + 13




Thread 13:
0   libsystem_kernel.dylib               0x00007fffab4d23b6 __ulock_wait + 10
1   libdispatch.dylib                    0x00007fffab385c6e _dispatch_thread_event_wait_slow + 85
2   libdispatch.dylib                --->0x00007fffab3785ea _dispatch_barrier_sync_f_slow + 402
3   Snagit                               0x000000010e1a5d68 -[AFURLSessionManager dataTaskWithRequest:completionHandler:] (AFURLSessionManager.m:664)
4   Snagit                               0x000000010e19083e -[AFHTTPSessionManager dataTaskWithHTTPMethod:URLString:parameters:success:failure:] (AFHTTPSessionManager.m:243)
5   Snagit                               0x000000010e18fb0d -[AFHTTPSessionManager GET:parameters:success:failure:] (AFHTTPSessionManager.m:112)
6   Snagit                               0x000000010e1d2f29 __51-[TSCAccountHTTPSession GET:parameters:completion:]_block_invoke (TSCAccountHTTPSession.m:317)
7   Snagit                               0x000000010e1d464f __58-[TSCAccountHTTPSession performNetworkRequest:completion:]_block_invoke_2 (TSCAccountHTTPSession.m:495)
8   libdispatch.dylib                    0x00007fffab375f5f _dispatch_call_block_and_release + 12
9   libdispatch.dylib                    0x00007fffab36d128 _dispatch_client_callout + 8
10  libdispatch.dylib                    0x00007fffab37c2ce _dispatch_queue_override_invoke + 743
11  libdispatch.dylib                    0x00007fffab36eee0 _dispatch_root_queue_drain + 476
12  libdispatch.dylib                    0x00007fffab36ecb7 _dispatch_worker_thread3 + 99
13  libsystem_pthread.dylib              0x00007fffab5b9746 _pthread_wqthread + 1299
14  libsystem_pthread.dylib              0x00007fffab5b9221 start_wqthread + 13

- (NSURLSessionDataTask *)dataTaskWithRequest:(NSURLRequest *)request
                            completionHandler:(void (^)(NSURLResponse *response, id responseObject, NSError *error))completionHandler
{
    __block NSURLSessionDataTask *dataTask = nil;
   dispatch_sync(
      url_session_manager_creation_queue(), ^{
         dataTask = [self.session dataTaskWithRequest:request];
      }
   );

    [self addDelegateForDataTask:dataTask completionHandler:completionHandler];

    return dataTask;
}

static dispatch_queue_t url_session_manager_creation_queue() {
    static dispatch_queue_t af_url_session_manager_creation_queue;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        af_url_session_manager_creation_queue = dispatch_queue_create("com.alamofire.networking.session.manager.creation", DISPATCH_QUEUE_SERIAL);
    });

    return af_url_session_manager_creation_queue;
}