Expo app not working on iOS 12

My iPhone was running on iOS 11.2 and today this morning i upgraded to the latest iOS 12
and i am started to face this issue that when i open my app its stays for 3 secs and it is
crashing. After the update i have started to face this issue.

Shane.
GroupMe LetGo

Same problem here, if I remove the WebView, the app works. So I believe the problem is on WebView component.

Console messages:

default	16:03:33.355933 -0300	Exponent	0x129e860f0 - FrameLoader::checkLoadCompleteForThisFrame: Finished frame load (frame = 0x117a2cfc0, main = 1)
default	16:03:33.472269 -0300	Exponent	Task <5ECF823C-9151-4ED2-A79A-D3DAFFE44E28>.<29> received response, status 200 content U
default	16:03:33.472419 -0300	Exponent	Task <5ECF823C-9151-4ED2-A79A-D3DAFFE44E28>.<29> done using Connection 33
default	16:03:33.472469 -0300	Exponent	Task <5ECF823C-9151-4ED2-A79A-D3DAFFE44E28>.<29> response ended
default	16:03:33.473079 -0300	Exponent	Task <E84AFB13-C3B4-4FA0-9F71-2FB939A23211>.<0> {strength 0, tls 4, ct 0, sub 0, sig 1, ciphers 0, bundle 0, builtin 0}
default	16:03:33.473133 -0300	Exponent	Task <E84AFB13-C3B4-4FA0-9F71-2FB939A23211>.<0> now using Connection 178
default	16:03:33.473183 -0300	Exponent	Task <E84AFB13-C3B4-4FA0-9F71-2FB939A23211>.<0> sent request, body N
default	16:03:33.477480 -0300	Exponent	Task <365D42F7-1F30-4304-A0DD-2BD7A53833AE>.<0> {strength 0, tls 4, ct 0, sub 0, sig 1, ciphers 0, bundle 0, builtin 0}
default	16:03:33.477766 -0300	Exponent	Task <365D42F7-1F30-4304-A0DD-2BD7A53833AE>.<0> now using Connection 183
default	16:03:33.477864 -0300	Exponent	Task <365D42F7-1F30-4304-A0DD-2BD7A53833AE>.<0> sent request, body N
default	16:03:33.529980 -0300	Exponent	0x11a7e9e00 - DocumentLoader::startLoadingMainResource: Returning empty document (frame = 0x11a944480, main = 1)
default	16:03:34.188185 -0300	assertiond	[Exponent:2723] Setting jetsam priority to 3 [0x108]
default	16:03:34.188806 -0300	assertiond	[Exponent:2723] setpriority(PRIO_DARWIN_ROLE, 2723, 3): ok
default	16:03:34.188862 -0300	assertiond	Client relinquished <BKProcessAssertion: 0x11b07e4a0; "Shared Background Assertion 0 for host.exp.Exponent" (finishTask:180s); id:…0A77605E1FAA>
default	16:03:34.189037 -0300	assertiond	[Exponent:2723] Deactivate assertion: <BKProcessAssertion: 0x11b07e4a0; "Shared Background Assertion 0 for host.exp.Exponent" (finishTask:180s); id:…0A77605E1FAA>
default	16:03:34.199609 -0300	assertiond	[Exponent:2723] New process assertion state; preventSuspend, preventThrottleDownUI, preventThrottleDownCPU, preventSuspendOnSleep (assertion 0x11b07e4a0 added: (none); removed: preventIdleSleep)
default	16:03:34.200193 -0300	assertiond	[Exponent:2723] Setting jetsam priority to 3 [0x100]
default	16:03:34.200703 -0300	assertiond	Releasing PowerAssertion on Exponent:2723 from update
default	16:03:34.201894 -0300	assertiond	[Exponent:2723] Remove assertion: <BKProcessAssertion: 0x11b07e4a0; "Shared Background Assertion 0 for host.exp.Exponent" (finishTask:180s); id:…0A77605E1FAA>
default	16:03:34.204309 -0300	mediaserverd	105: { "action":"client_died", "session":{"ID":"0x36a279","PID":2723,"name":"Exponent"}, "details":null }
default	16:03:34.206870 -0300	powerd	Process assertiond.72 Released SystemIsActive "Exponent:2723:2723-A1E1D6BA-F39E-4469-AF60-0A77605E1FAA [Shared Background Assertion 0 for host.exp.Exponent] [0x11b07e4a0]" age:00:01:34  id:51539647296 [System: SysAct]
default	16:03:34.310096 -0300	locationd	Client host.exp.Exponent disconnected
default	16:03:34.310821 -0300	locationd	{"msg":"#CLIUA Marking change", "clientKey":"host.exp.Exponent", "reason":"In-use halo-effect", "assertionLevel":4, "coming":0}
error	16:03:34.319596 -0300	symptomsd	Can't get most elevated app state from dictionary {
    BKSApplicationStateExtensionKey = 0;
    SBApplicationStateDisplayIDKey = "host.exp.Exponent";
    SBApplicationStateKey = 0;
    SBApplicationStateProcessIDKey = 2723;
    SBApplicationStateRunningReasonsKey =     (
                {
            SBApplicationStateRunningReasonAssertionIdentifierKey = Resume;
            SBApplicationStateRunningReasonAssertionReasonKey = 10000;
        },
                {
            SBApplicationStateRunningReasonAssertionIdentifierKey = "Shared Background Assertion 0 for host.exp.Exponent";
            SBApplicationStateRunningReasonAssertionReasonKey = 4;
        }
    );
}
default	16:03:34.319651 -0300	symptomsd	2723 host.exp.Exponent: Unknown (most elevated: Unknown)
default	16:03:34.321342 -0300	SpringBoard	WIFI PICKER [host.exp.Exponent]: isProcessLaunch: 0,    isForegroundActivation: 0,     isForegroundDeactivation: 1
default	16:03:34.328375 -0300	symptomsd	Entry, display name host.exp.Exponent uuid (null) pid 2723 isFront 0
default	16:03:34.328597 -0300	symptomsd	Continue with bundle name host.exp.Exponent, is front 0
default	16:03:34.328653 -0300	symptomsd	host.exp.Exponent: Foreground: false
default	16:03:34.502782 -0300	ReportCrash	Formulating report for corpse[2723] Exponent
default	16:03:34.636928 -0300	ReportCrash	Saved type '109(<private>)' report (6 of max 25) at /var/mobile/Library/Logs/CrashReporter/Exponent-2018-09-18-160334.ips
default	16:03:34.795500 -0300	assertiond	[Exponent:2723] Port death watcher fired.
default	16:03:34.796785 -0300	assertiond	[Exponent:2723] Ignoring assertion remove, because we are terminated or pending termination
default	16:03:34.796972 -0300	assertiond	Process exited: <BKProcess: 0x11b01cbb0; Exponent; host.exp.Exponent; pid: 2723; agency: Application; visibility: none; task: none; hostpid: 2202>
default	16:03:34.797085 -0300	assertiond	[Exponent:2723] Invalidating...
default	16:03:34.949942 -0300	assertiond	[Exponent:2723] Got exit context: <BKSProcessExitContext: 0x11b0774f0; reason: crash>
default	16:03:34.950258 -0300	SpringBoard	<FBApplicationProcess: 0x1174cc810; Exponent (host.exp.Exponent); pid: 2723> assertiond says the process actually exited with context: <BKSProcessExitContext: 0x282a34070; reason: crash>
default	16:03:34.950353 -0300	SpringBoard	<FBApplicationProcess: 0x1174cc810; Exponent (host.exp.Exponent); pid: 2723> crashed.
default	16:03:34.951054 -0300	SpringBoard	Removing: <FBApplicationProcess: 0x1174cc810; Exponent (host.exp.Exponent); pid: 2723>
default	16:03:34.956190 -0300	assertiond	[Exponent:2723] Terminating because the job-submitter has disconnected.
default	16:03:34.956507 -0300	assertiond	Deleted job with label: UIKitApplication:host.exp.Exponent[0x8747][72]
default	16:03:34.956729 -0300	assertiond	[Exponent:2723] Deleted launchd job with label: UIKitApplication:host.exp.Exponent[0x8747][72]
default	16:03:34.956893 -0300	assertiond	[Exponent:2723] Invalidation complete.
default	16:03:34.957100 -0300	mediaserverd	-CMSessionMgr- CMSessionMgrHandleApplicationStateChange: CMSession: Client host.exp.Exponent with pid '2723' is now Terminated. Background entitlement: NO
default	16:03:34.957166 -0300	assertiond	Checking for deferred bootstrap request for host.exp.Exponent
default	16:03:34.957223 -0300	assertiond	[Exponent:2723] Removing client: <BKProcessInfoServerClient: 0x11b067760; pid: 2202>
default	16:03:34.957281 -0300	assertiond	[Exponent:2723] No clients remain.
default	16:03:34.957923 -0300	SpringBoard	Process exited: <FBApplicationProcess: 0x1174cc810; Exponent (host.exp.Exponent); pid: -1> -> <FBApplicationProcessExitContext: 0x282777c30; exitReason: crash; terminationReason: (none)> {
    stateAtExit = <FBProcessState: 0x282e4d380; pid: 2723; taskState: Not Running; visibility: Unknown>;
}
default	16:03:34.958387 -0300	SpringBoard	Application process state changed for host.exp.Exponent: (null)
default	16:03:34.970954 -0300	symptomsd	2723 host.exp.Exponent: Terminated (most elevated: Terminated)
default	16:03:34.971028 -0300	SpringBoard	WIFI PICKER [host.exp.Exponent]: isProcessLaunch: 0,    isForegroundActivation: 0,     isForegroundDeactivation: 0
default	16:03:34.971571 -0300	symptomsd	Entry, display name host.exp.Exponent uuid (null) pid 2723 isFront 0
default	16:03:35.042422 -0300	SpringBoard	[SBMainDisplaySceneManager sceneManager:didDestroyScene: <FBScene: 0x281985e00; sceneID: host.exp.Exponent; valid: NO>] - proposing IdleTimerBehavior.

Device Log

Incident Identifier: F0611F0A-9F2B-42BE-8378-XX97B6DC1194
CrashReporter Key:   b0d4c62e97e582312096cca5557f51cbca1edf7c
Hardware Model:      iPhone10,3
Process:             Exponent [2723]
Path:                /private/var/containers/Bundle/Application/BF0BFE9D-AE56-414D-BFD8-4D83E38D07BD/Exponent.app/Exponent
Identifier:          host.exp.Exponent
Version:             2.8.0.1016826 (2.8.0)
AppVariant:          iPhone10,3
Code Type:           ARM-64 (Native)
Role:                Non UI
Parent Process:      launchd [1]
Coalition:           host.exp.Exponent [1220]


Date/Time:           2018-09-18 16:03:34.2609 -0300
Launch Time:         2018-09-18 16:01:59.6712 -0300
OS Version:          iPhone OS 12.0 (16A366)
Baseband Version:    3.00.00
Report Version:      104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001c7eb70c0
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [2723]
Triggered by Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   WebCore                       	0x00000001c7eb70c0 WebCore::FrameLoader::checkCompleted+ 16560320 () + 592
1   WebCore                       	0x00000001c7eb4900 WebCore::FrameLoader::init+ 16550144 () + 740
2   WebCore                       	0x00000001c7eb4900 WebCore::FrameLoader::init+ 16550144 () + 740
3   WebKitLegacy                  	0x00000001c878d1e0 +[WebFrame+ 16864 (WebInternal) _createMainFrameWithPage:frameName:frameView:] + 332
4   WebKitLegacy                  	0x00000001c878be90 -[WebView+ 11920 (WebPrivate) _commonInitializationWithFrameName:groupName:] + 2924
5   WebKitLegacy                  	0x00000001c878b2f8 -[WebView+ 8952 (WebPrivate) _initWithFrame:frameName:groupName:] + 132
6   UIKitCore                     	0x00000001eb5e99f4 -[UIWebDocumentView initWithWebView:frame:] + 320
7   UIKitCore                     	0x00000001eb5dd304 -[UIWebBrowserView initWithWebView:frame:] + 48
8   UIKitCore                     	0x00000001eb5dd540 -[UIWebBrowserView initWithFrame:] + 44
9   UIKitCore                     	0x00000001eb62fe7c -[UIWebView _webViewCommonInitWithWebView:scalesPageToFit:] + 244
10  UIKitCore                     	0x00000001eb6306e0 -[UIWebView initWithFrame:] + 76
11  Exponent                      	0x00000001017d17a8 0x10092c000 + 15357864
12  Exponent                      	0x00000001017d3300 0x10092c000 + 15364864
13  Exponent                      	0x0000000101718dac 0x10092c000 + 14601644
14  Exponent                      	0x00000001017bb15c 0x10092c000 + 15266140
15  libdispatch.dylib             	0x00000001be0236c8 _dispatch_call_block_and_release + 24
16  libdispatch.dylib             	0x00000001be024484 _dispatch_client_callout + 16
17  libdispatch.dylib             	0x00000001be003b44 _dispatch_main_queue_callback_4CF$VARIANT$armv81 + 1012
18  CoreFoundation                	0x00000001be57a1bc __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
19  CoreFoundation                	0x00000001be575084 __CFRunLoopRun + 1964
20  CoreFoundation                	0x00000001be5745b8 CFRunLoopRunSpecific + 436
21  GraphicsServices              	0x00000001c07e8584 GSEventRunModal + 100
22  UIKitCore                     	0x00000001eae9f558 UIApplicationMain + 212
23  Exponent                      	0x00000001009f597c 0x10092c000 + 825724
24  libdyld.dylib                 	0x00000001be034b94 start + 4

Thread 1 name:  com.apple.uikit.eventfetch-thread
Thread 1:
0   libsystem_kernel.dylib        	0x00000001be175ed0 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001be1753a8 mach_msg + 72
2   CoreFoundation                	0x00000001be579fb0 __CFRunLoopServiceMachPort + 236
3   CoreFoundation                	0x00000001be574e4c __CFRunLoopRun + 1396
4   CoreFoundation                	0x00000001be5745b8 CFRunLoopRunSpecific + 436
5   Foundation                    	0x00000001bef686a4 -[NSRunLoop+ 34468 (NSRunLoop) runMode:beforeDate:] + 300
6   Foundation                    	0x00000001bef68550 -[NSRunLoop+ 34128 (NSRunLoop) runUntilDate:] + 148
7   UIKitCore                     	0x00000001eadfcac0 -[UIEventFetcher threadMain] + 136
8   Foundation                    	0x00000001bf09b3b0 __NSThread__start__ + 1040
9   libsystem_pthread.dylib       	0x00000001be2052fc _pthread_body + 128
10  libsystem_pthread.dylib       	0x00000001be20525c _pthread_start + 48
11  libsystem_pthread.dylib       	0x00000001be208d08 thread_start + 4

Thread 2 name:  Dispatch queue: NSOperationQueue 0x2801da4e0 (QOS: UNSPECIFIED)
Thread 2:
0   libsystem_kernel.dylib        	0x00000001be175f0c semaphore_wait_trap + 8
1   libdispatch.dylib             	0x00000001bdff2b90 _dispatch_sema4_wait$VARIANT$armv81 + 24
2   libdispatch.dylib             	0x00000001bdff3600 _dispatch_semaphore_wait_slow + 128
3   WebCore                       	0x00000001c6ef00c4 -[WebCoreResourceHandleAsOperationQueueDelegate connection:didReceiveResponse:] + 180
4   CFNetwork                     	0x00000001bee23a6c __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 60
5   Foundation                    	0x00000001bf077b6c __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
6   Foundation                    	0x00000001bef7fcc8 -[NSBlockOperation main] + 72
7   Foundation                    	0x00000001bef7f19c -[__NSOperationInternal _start:] + 740
8   Foundation                    	0x00000001bf079a40 __NSOQSchedule_f + 272
9   libdispatch.dylib             	0x00000001be0236c8 _dispatch_call_block_and_release + 24
10  libdispatch.dylib             	0x00000001be024484 _dispatch_client_callout + 16
11  libdispatch.dylib             	0x00000001bdffae14 _dispatch_continuation_pop$VARIANT$armv81 + 404
12  libdispatch.dylib             	0x00000001bdffa5b4 _dispatch_async_redirect_invoke + 780
13  libdispatch.dylib             	0x00000001be006afc _dispatch_root_queue_drain + 344
14  libdispatch.dylib             	0x00000001be00735c _dispatch_worker_thread2 + 116
15  libsystem_pthread.dylib       	0x00000001be206190 _pthread_wqthread + 472
16  libsystem_pthread.dylib       	0x00000001be208d00 start_wqthread + 4

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