Index: linux-2.6/net/ipv4/netfilter/ipt_ULOG.c
===================================================================
RCS file: /cvs/linux-2.6/net/ipv4/netfilter/ipt_ULOG.c,v
retrieving revision 1.6
diff -u -r1.6 ipt_ULOG.c
--- linux-2.6/net/ipv4/netfilter/ipt_ULOG.c	27 Jul 2006 22:00:49 -0000	1.6
+++ linux-2.6/net/ipv4/netfilter/ipt_ULOG.c	10 Aug 2006 16:30:42 -0000
@@ -120,6 +120,11 @@
 	if (ub->qlen > 1)
 		ub->lastnlh->nlmsg_type = NLMSG_DONE;
 
+	if (!ub->skb) {
+		DEBUGP("ipt_ULOG: ulog_send: nothing to send\n");
+		return;
+	}
+
 	NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
 	DEBUGP("ipt_ULOG: throwing %d packets to netlink group %u\n",
 		ub->qlen, nlgroupnum + 1);