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-rw-r--r--sbin/ipfw/ipfw2.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index 8cc92e1..11ccb9f 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -3001,7 +3001,7 @@ ipfw_add(char *av[])
action->opcode = O_NAT;
action->len = F_INSN_SIZE(ipfw_insn_nat);
CHECK_ACTLEN;
- if (_substrcmp(*av, "global") == 0) {
+ if (*av != NULL && _substrcmp(*av, "global") == 0) {
action->arg1 = 0;
av++;
break;
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