--- linux-2.6.20-rc3/net/ipv4/netfilter/ipt_MASQUERADE.c.orig	2007-01-02 22:47:14.000000000 +0100
+++ linux-2.6.20-rc3/net/ipv4/netfilter/ipt_MASQUERADE.c	2007-01-02 22:57:11.000000000 +0100
@@ -127,10 +127,13 @@
 static inline int
 device_cmp(struct ip_conntrack *i, void *ifindex)
 {
+	int ret;
 #ifdef CONFIG_NF_NAT_NEEDED
 	struct nf_conn_nat *nat = nfct_nat(i);
+
+	if (!nat)
+		return 0;
 #endif
-	int ret;
 
 	read_lock_bh(&masq_lock);
 #ifdef CONFIG_NF_NAT_NEEDED