--- quiz.module.orig	2013-01-22 16:32:11.807188523 -0800
+++ quiz.module	2013-01-22 16:35:51.660841977 -0800
@@ -233,7 +233,7 @@
   global $user;
   if (!user_access('view own quiz results'))
     return FALSE;
-  $time_end = db_result(db_query('SELECT time_end FROM {quiz_node_results} WHERE result_id = %d AND uid = %d', $rid, $user->uid));
+  $time_end = db_query('SELECT time_end FROM {quiz_node_results} WHERE result_id = :rid AND uid = :uid', array(':rid' => $rid, ':uid' => $user->uid))->fetchField();
   return $time_end > 0;
 }