--- fwsync/patches/sync.c	2022/06/22 13:01:55	1.1
+++ fwsync/patches/sync.c	2022/08/12 11:32:28	1.2
@@ -104,7 +104,7 @@ ipfw_config_sync(int ac, char **av)
 				if (inet_pton(AF_INET6, host, &cfg->addr[0].ip6.sin6_addr) != 1)
 					errx(EX_DATAERR, "invalid edge IPv6 address\n");
 		}
-	} else if (!strcmp(*av, "collector")) {
+	} else if (ac && !strcmp(*av, "collector")) {
 		SYNC_SHIFT_ARG;
 		if (!ac)
 			errx(EX_DATAERR, "missing destination(s) address[,port]\n");