Kein Fragment Commit wenn isStateSaved

app/src/main/java/de/sebse/fuplanner/MainActivity.java

@@ -313,6 +313,9 @@ public class MainActivity extends AppCompatActivity
     }
 
     private void changeFragment(int newFragment, String newData) {
+        if (mFragmentManager.isStateSaved())
+            return;
+
         //log.d("changeFragment: ", newFragment, newData);
         onTitleTextChange(R.string.courses);
         Fragment fragment;