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diff -up dhcp-4.2.0/common/dispatch.c.dracut dhcp-4.2.0/common/dispatch.c
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--- dhcp-4.2.0/common/dispatch.c.dracut	2010-06-01 19:29:59.000000000 +0200
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+++ dhcp-4.2.0/common/dispatch.c	2010-07-21 16:10:09.000000000 +0200
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@@ -189,6 +189,10 @@ void add_timeout (when, where, what, ref
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 	isc_interval_t interval;
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 	isc_time_t expires;
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+	if (when == NULL) {
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+		return;
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+	}
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+
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 	/* See if this timeout supersedes an existing timeout. */
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 	t = (struct timeout *)0;
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 	for (q = timeouts; q; q = q->next) {