Need help with crash report

Almost got my first app off the ground and I just can't figure out this report. Any help is appreciated!

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  1

Last Exception Backtrace:
0   CoreFoundation                	0x181b99d78 __exceptionPreprocess + 220 (NSException.m:200)
1   libobjc.A.dylib               	0x19a7fe734 objc_exception_throw + 60 (objc-exception.mm:565)
2   Brotein                       	0x100efcc60 RCTFatal + 668 (RCTAssert.m:145)
3   Brotein                       	0x100f787c8 -[RCTExceptionsManager reportFatal:stack:exceptionId:suppressRedBox:] + 492 (RCTExceptionsManager.mm:76)
4   Brotein                       	0x100f790f0 -[RCTExceptionsManager reportException:] + 1532 (RCTExceptionsManager.mm:145)
5   CoreFoundation                	0x181b22614 __invoking___ + 148
6   CoreFoundation                	0x181b40100 -[NSInvocation invoke] + 468 (NSForwarding.m:3378)
7   CoreFoundation                	0x181b7713c -[NSInvocation invokeWithTarget:] + 80 (NSForwarding.m:3475)
8   Brotein                       	0x100f2c580 -[RCTModuleMethod invokeWithBridge:module:arguments:] + 460 (RCTModuleMethod.mm:584)
9   Brotein                       	0x100f2e648 facebook::react::invokeInner(RCTBridge*, RCTModuleData*, unsigned int, folly::dynamic const&) + 244 (RCTNativeModule.mm:114)
10  Brotein                       	0x100f2e3b8 operator() + 44 (RCTNativeModule.mm:75)
11  Brotein                       	0x100f2e3b8 invocation function for block in facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&&, int) + 88 (RCTNativeModule.mm:67)
12  libdispatch.dylib             	0x1817fee68 _dispatch_call_block_and_release + 32 (init.c:1517)
13  libdispatch.dylib             	0x181800a2c _dispatch_client_callout + 20 (object.m:560)
14  libdispatch.dylib             	0x181808124 _dispatch_lane_serial_drain + 668 (inline_internal.h:2622)
15  libdispatch.dylib             	0x181808c80 _dispatch_lane_invoke + 392 (queue.c:3944)
16  libdispatch.dylib             	0x181813500 _dispatch_workloop_worker_thread + 648 (queue.c:6732)
17  libsystem_pthread.dylib       	0x1f2b1e0bc _pthread_wqthread + 288 (pthread.c:2599)
18  libsystem_pthread.dylib       	0x1f2b1de5c start_wqthread + 8

Thread 0 name:
Thread 0:
0   QuartzCore                    	0x000000018588aaf4 CA::Layer::update_for_changed_sublayers(CA::Transaction*, unsigned int) + 240 (CALayerInternal.h:0)
1   QuartzCore                    	0x000000018588e9c0 CA::Layer::insert_sublayer(CA::Transaction*, CALayer*, unsigned long) + 556 (CALayer.mm:6188)
2   QuartzCore                    	0x00000001858a6120 -[CALayer addSublayer:] + 204 (CALayer.mm:6276)
3   UIKitCore                     	0x00000001840f9f00 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1296 (UIView.m:16715)
4   Brotein                       	0x0000000100f694b8 -[UIView(React) didUpdateReactSubviews] + 188 (UIView+React.m:184)
5   Brotein                       	0x0000000100f60558 -[RCTView didUpdateReactSubviews] + 76 (RCTView.m:573)
6   Brotein                       	0x0000000100f57048 __48-[RCTUIManager _dispatchChildrenDidChangeEvents]_block_invoke + 216 (RCTUIManager.m:1265)
7   Brotein                       	0x0000000100f56a68 __44-[RCTUIManager flushUIBlocksWithCompletion:]_block_invoke + 184 (RCTUIManager.m:1189)
8   Brotein                       	0x0000000100f56b5c __44-[RCTUIManager flushUIBlocksWithCompletion:]_block_invoke.417 + 28 (RCTUIManager.m:1209)
9   libdispatch.dylib             	0x00000001817fee68 _dispatch_call_block_and_release + 32 (init.c:1517)
10  libdispatch.dylib             	0x0000000181800a2c _dispatch_client_callout + 20 (object.m:560)
11  libdispatch.dylib             	0x000000018180ef48 _dispatch_main_queue_drain + 928 (inline_internal.h:2622)
12  libdispatch.dylib             	0x000000018180eb98 _dispatch_main_queue_callback_4CF + 44 (queue.c:7770)
13  CoreFoundation                	0x0000000181b522f0 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 (CFRunLoop.c:1795)
14  CoreFoundation                	0x0000000181b0c1f4 __CFRunLoopRun + 2532 (CFRunLoop.c:3144)
15  CoreFoundation                	0x0000000181b1f6b8 CFRunLoopRunSpecific + 600 (CFRunLoop.c:3268)
16  GraphicsServices              	0x000000019dbb9374 GSEventRunModal + 164 (GSEvent.c:2200)
17  UIKitCore                     	0x0000000184484e88 -[UIApplication _run] + 1100 (UIApplication.m:3511)
18  UIKitCore                     	0x00000001842065ec UIApplicationMain + 364 (UIApplication.m:5064)
19  Brotein                       	0x0000000100e82fb8 main + 88 (main.m:7)
20  dyld                          	0x0000000101395ce4 start + 520 (dyldMain.cpp:879)

Thread 1 name:
Thread 1 Crashed:
0   libsystem_kernel.dylib        	0x00000001b9508b78 __pthread_kill + 8
1   libsystem_pthread.dylib       	0x00000001f2b243bc pthread_kill + 268 (pthread.c:1668)
2   libsystem_c.dylib             	0x000000018cc7c51c abort + 168 (abort.c:118)
3   libc++abi.dylib               	0x000000019a909b7c abort_message + 132 (abort_message.cpp:78)
4   libc++abi.dylib               	0x000000019a8f99c4 demangling_terminate_handler() + 336 (cxa_default_handlers.cpp:71)
5   libobjc.A.dylib               	0x000000019a804c88 _objc_terminate() + 144 (objc-exception.mm:701)
6   libc++abi.dylib               	0x000000019a908f18 std::__terminate(void (*)()) + 20 (cxa_handlers.cpp:59)
7   libc++abi.dylib               	0x000000019a908eb4 std::terminate() + 64 (cxa_handlers.cpp:88)
8   libdispatch.dylib             	0x0000000181800a40 _dispatch_client_callout + 40 (object.m:563)
9   libdispatch.dylib             	0x0000000181808124 _dispatch_lane_serial_drain + 668 (inline_internal.h:2622)
10  libdispatch.dylib             	0x0000000181808c80 _dispatch_lane_invoke + 392 (queue.c:3944)
11  libdispatch.dylib             	0x0000000181813500 _dispatch_workloop_worker_thread + 648 (queue.c:6732)
12  libsystem_pthread.dylib       	0x00000001f2b1e0bc _pthread_wqthread + 288 (pthread.c:2599)
13  libsystem_pthread.dylib       	0x00000001f2b1de5c start_wqthread + 8

Exception Type: EXC_CRASH (SIGABRT)

Something important was missing at a bad time

By the way, this app works fine in the simulator, these crashes happen in TestFlight. The splash appears for a split second, and then the crash occurs.

Need help with crash report
 
 
Q