android: IllegalArgumentException on exiting preferences

src/org/adblockplus/android/Preferences.java

 /*
  * This file is part of the Adblock Plus,
  * Copyright (C) 2006-2012 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 199 matching lines @@
     if (showAbout)
       onAbout(findViewById(R.id.btn_about));
     
     bindService(new Intent(this, ProxyService.class), proxyServiceConnection, 0);
   }
 
   @Override
   public void onPause()
   {
     super.onPause();
-    unregisterReceiver(receiver);
+    try
+    {
+      unregisterReceiver(receiver);
+    }
+    catch (IllegalArgumentException e)
+    {
+      // ignore - it is thrown if receiver is not registered but it can not be true in normal conditions
+    }
     unbindService(proxyServiceConnection);
     proxyService = null;
   }
 
   @Override
   protected void onStop()
   {
     super.onStop();
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
     boolean enabled = prefs.getBoolean(getString(R.string.pref_enabled), false);
@@ skipping 277 matching lines @@
           showConfigurationMsg(getString(R.string.msg_configuration, proxyService.port));
     }
 
     public void onServiceDisconnected(ComponentName className)
     {
       proxyService = null;
       Log.d(TAG, "Proxy service disconnected");
     }
   };
 }