Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class android.view.View.getClass()' on a null object reference
       at com.android.internal.app.WindowDecorActionBar.getDecorToolbar(WindowDecorActionBar.java:244)
       at com.android.internal.app.WindowDecorActionBar.init(WindowDecorActionBar.java:196)
       at com.android.internal.app.WindowDecorActionBar.<init>(WindowDecorActionBar.java:178)
       at android.app.Dialog.show(Dialog.java:305)
       at android.support.v7.app.AlertDialog$Builder.show(AlertDialog.java:956)
       ...