diff --git a/minifirewall b/minifirewall
index b159547..62f6fce 100755
--- a/minifirewall
+++ b/minifirewall
@@ -115,6 +115,8 @@ chain_exists() {
     chain_name="$1"
     if [ $# -ge 2 ]; then
         intable="--table $2"
+    else
+        intable=""
     fi
     # shellcheck disable=SC2086
     iptables ${intable} -nL "${chain_name}" >/dev/null 2>&1