diff --git a/beta.sh b/beta.sh
index b0b3eb4..7ec59a4 100644
--- a/beta.sh
+++ b/beta.sh
@@ -152,6 +152,8 @@ configure_simple_firewall() {
         read port
         if [ "$port" = "done" ]; then
             break
+        elif ! echo "$port" | grep -qE '^[0-9]+$'; then
+            echo "Invalid input: Please enter a numeric value."
         elif echo "$ports" | grep -q "^$port\$"; then
             # Remove port
             ports=$(echo "$ports" | grep -v "^$port\$")
@@ -171,6 +173,7 @@ configure_simple_firewall() {
 }
 
 
+
 # Function for Simplefirewall Submenu
 simplefirewall_menu() {
 while true; do