Hi,
I updated from expo 25 to 26.
I have an app. On IOS it’s still work just fine.
But I have an error on my android device when I’m trying to login :
‘Attempt to invoke virtual method ‘int java.lang.String.hasCode()’ on a null object reference’
Does anyone know what can I do ?
Thanks
Hard to say without more context about where it’s being thrown and why. Maybe Android is catching an underlaying error that it used to ignore 
Is this being invoked from any particular API?
I got this after upgrade to expo 26. Seems to be related to marker images for maps. I only get this for android standalone build:
--------- beginning of crash
04-01 18:49:38.444 31343 31343 E AndroidRuntime: FATAL EXCEPTION: main
04-01 18:49:38.444 31343 31343 E AndroidRuntime: Process: com.NeighborWatch.NeighborWatch, PID: 31343
04-01 18:49:38.444 31343 31343 E AndroidRuntime: java.lang.RuntimeException: com.google.maps.api.android.lib6.common.apiexception.b: Failed to decode image. The provided image must be a Bitmap.
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.bridge.ReactContext.handleException(ReactContext.java:313)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.GuardedFrameCallback.doFrame(GuardedFrameCallback.java:33)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.modules.core.ReactChoreographer$ReactChoreographerDispatcher.doFrame(ReactChoreographer.java:136)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.modules.core.ChoreographerCompat$FrameCallback$1.doFrame(ChoreographerCompat.java:107)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:909)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.view.Choreographer.doCallbacks(Choreographer.java:723)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.view.Choreographer.doFrame(Choreographer.java:655)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:790)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.os.Looper.loop(Looper.java:164)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6494)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: Caused by: com.google.maps.api.android.lib6.common.apiexception.b: Failed to decode image. The provided image must be a Bitmap.
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.maps.api.android.lib6.impl.n.a(com.google.android.gms.DynamiteModulesB@12221440@12.2.21 (440-188803320):12)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.maps.api.android.lib6.impl.o.a(com.google.android.gms.DynamiteModulesB@12221440@12.2.21 (440-188803320):7)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.maps.api.android.lib6.impl.db.(com.google.android.gms.DynamiteModulesB@12221440@12.2.21 (440-188803320):25)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.maps.api.android.lib6.impl.bc.a(com.google.android.gms.DynamiteModulesB@12221440@12.2.21 (440-188803320):496)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.android.gms.maps.internal.l.onTransact(com.google.android.gms.DynamiteModulesB@12221440@12.2.21 (440-188803320):94)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at android.os.Binder.transact(Binder.java:627)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.android.gms.maps.a.b$a$a.a(Unknown Source:28)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at com.google.android.gms.maps.c.a(Unknown Source:2)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.host.exp.exponent.modules.api.components.maps.AirMapMarker.addToMap(AirMapMarker.java:297)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.host.exp.exponent.modules.api.components.maps.AirMapView.addFeature(AirMapView.java:481)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.host.exp.exponent.modules.api.components.maps.AirMapManager.addView(AirMapManager.java:350)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.host.exp.exponent.modules.api.components.maps.AirMapManager.addView(AirMapManager.java:27)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.NativeViewHierarchyManager.manageChildren(NativeViewHierarchyManager.java:311)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.UIViewOperationQueue$ManageChildrenOperation.execute(UIViewOperationQueue.java:180)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.UIViewOperationQueue$1.run(UIViewOperationQueue.java:822)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.UIViewOperationQueue.flushPendingBatches(UIViewOperationQueue.java:929)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.UIViewOperationQueue.access$2100(UIViewOperationQueue.java:47)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.UIViewOperationQueue$DispatchUIFrameCallback.doFrameGuarded(UIViewOperationQueue.java:989)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: at abi26_0_0.com.facebook.react.uimanager.GuardedFrameCallback.doFrame(GuardedFrameCallback.java:31)
04-01 18:49:38.444 31343 31343 E AndroidRuntime: … 13 more
You can test how the app will run in prod by running exp start --no-dev --minify this should surface better errors for you
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