NPE on `MainFragment#computeScroll`

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Issue explanation (write below this line)

Exception

• App Name: Amaze
• Package: com.amaze.filemanager
• Version: 3.10
• User Action: UI Error
• Request: Application crash
• OS: Linux Android 10 - 29
• Device: 8705F
• Model: Lenovo TB-8705F
• Product: LenovoTB-8705F-EEA

Crash log

java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=0, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.amaze.filemanager/com.amaze.filemanager.ui.activities.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.ViewGroup.getChildAt(int)' on a null object reference
 at android.app.ActivityThread.deliverResults(ActivityThread.java:4877)
 at android.app.ActivityThread.handleSendResult(ActivityThread.java:4918)
 at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
 at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
 at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2045)
 at android.os.Handler.dispatchMessage(Handler.java:107)
 at android.os.Looper.loop(Looper.java:214)
 at android.app.ActivityThread.main(ActivityThread.java:7405)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:502)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.ViewGroup.getChildAt(int)' on a null object reference
 at com.amaze.filemanager.ui.fragments.MainFragment.computeScroll(MainFragment.java:1069)
 at com.amaze.filemanager.ui.fragments.MainFragment.updateList(MainFragment.java:1219)
 at com.amaze.filemanager.ui.activities.MainActivity.onPermissionGranted(MainActivity.java:553)
 at com.amaze.filemanager.ui.activities.superclasses.PermissionsActivity.onRequestPermissionsResult(PermissionsActivity.java:71)
 at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:8335)
 at android.app.Activity.dispatchActivityResult(Activity.java:8185)
 at android.app.ActivityThread.deliverResults(ActivityThread.java:4870)
 ... 11 more

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Reporter: andymarkovic