I am getting this crash on a Nexus device (a Sony one with the same OS version does not crash):

```
02-20 14:38:14.551 22255 22255 I DebugActivity: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.support.v4.app.FragmentManagerImpl.ensureExecReady(FragmentManager.java:2180)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2233)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:379)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.support.v4.app.FragmentActivity.onResume(FragmentActivity.java:461)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at com.whatever.sdk.MyActivity.onResume(MyActivity.java:109)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at com.whatever.sdk.MyActivity$1.onCallStateChanged(MyActivity.java:231)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:295)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.os.Handler.dispatchMessage(Handler.java:102)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.os.Looper.loop(Looper.java:148)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at android.app.ActivityThread.main(ActivityThread.java:5417)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at java.lang.reflect.Method.invoke(Native Method)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
02-20 14:38:14.551 22255 22255 I DebugActivity:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

```

And here is the relevant piece of code:

```
public class MyActivity extends AppCompatActivity {
...
    private final PhoneStateListener phoneStateListener = new PhoneStateListener() {
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            if(state == TelephonyManager.CALL_STATE_IDLE) {
                MyActivity.this.onResume();
...
    @Override
    protected void onResume() {
        try {
            super.onResume();
...

```

The activity is not declared with any launchMode and trying to add different flags such as `Intent.FLAG_ACTIVITY_CLEAR_TOP` when starting the activity did not help. We have `supportLibraryVersion = '27.0.2'`

*Is there an obvious fix to this and why is it happening on some devices and not on others?*