diff -r 7bcccfa734e2 -r ac1affcd5d22 loudmouth/lm-message-handler.c
--- a/loudmouth/lm-message-handler.c	Tue Aug 22 23:33:06 2006 +0000
+++ b/loudmouth/lm-message-handler.c	Fri Sep 01 14:01:48 2006 +0000
@@ -71,6 +71,8 @@
                         GDestroyNotify          notify)
 {
         LmMessageHandler *handler;
+
+	g_return_val_if_fail (function != NULL, NULL);
         
         handler = g_new0 (LmMessageHandler, 1);
         
@@ -110,6 +112,8 @@
 gboolean
 lm_message_handler_is_valid (LmMessageHandler *handler)
 {
+	g_return_val_if_fail (handler != NULL, FALSE);
+
 	return handler->valid;
 }