Don't allow onBackPressed to be called while AstridActivity is finishing. This could happen when restarting activity after a theme change or something

astrid/src/com/todoroo/astrid/activity/AstridActivity.java

@@ -287,6 +287,8 @@ public class AstridActivity extends FragmentActivity
 
     @Override
     public void onBackPressed() {
+        if (isFinishing())
+            return;
         super.onBackPressed();
     }