diff --git a/src/notification.c b/src/notification.c
index 6fe44f1..41d64e2 100644
--- a/src/notification.c
+++ b/src/notification.c
@@ -133,6 +133,7 @@ zenity_notification_handle_stdin (GIOChannel *channel,
           if (error) {
             g_warning ("Error showing notification: %s", error->message);
             g_error_free (error);
+            error = NULL;
           }
 
 	  g_object_unref (notif);
@@ -150,6 +151,7 @@ zenity_notification_handle_stdin (GIOChannel *channel,
           if (error) {
             g_warning ("Error showing notification: %s", error->message);
             g_error_free (error);
+            error = NULL;
           }
         }
       } else if (!g_ascii_strcasecmp (command, "visible")) {