diff -up dhcp-4.2.0/common/dispatch.c.dracut dhcp-4.2.0/common/dispatch.c

--- dhcp-4.2.0/common/dispatch.c.dracut	2010-06-01 19:29:59.000000000 +0200

+++ dhcp-4.2.0/common/dispatch.c	2010-07-21 16:10:09.000000000 +0200

@@ -189,6 +189,10 @@ void add_timeout (when, where, what, ref

 	isc_interval_t interval;

 	isc_time_t expires;

+	if (when == NULL) {

+		return;

+	}

+

 	/* See if this timeout supersedes an existing timeout. */

 	t = (struct timeout *)0;

 	for (q = timeouts; q; q = q->next) {