diff --git a/phpBB/privmsg.php b/phpBB/privmsg.php
index bbbb20fbd6..2e91606910 100644
--- a/phpBB/privmsg.php
+++ b/phpBB/privmsg.php
@@ -1743,6 +1743,8 @@ switch($folder)
 				AND pm.privmsgs_type = " . PRIVMSGS_SAVED_OUT_MAIL . "
 				AND u.user_id = pm.privmsgs_from_userid ) )";
 		break;
+	default:
+		message_die(GENERAL_ERROR, "Could not query private message information. No folder specified.", "", __LINE__, __FILE__, $sql);
 }
 
 //
@@ -2010,4 +2012,4 @@ $template->pparse("body");
 
 include($phpbb_root_path . 'includes/page_tail.'.$phpEx);
 
-?>
\ No newline at end of file
+?>