diff --git a/.vscode/numbered-bookmarks.json b/.vscode/numbered-bookmarks.json
index dcdf4d1..1d0bf1d 100644
--- a/.vscode/numbered-bookmarks.json
+++ b/.vscode/numbered-bookmarks.json
@@ -6,13 +6,13 @@
 				-1,
 				19,
 				54,
-				748,
+				751,
 				68,
 				-1,
 				-1,
 				-1,
-				637,
-				738
+				640,
+				616
 			]
 		}
 	]
diff --git a/setup.sh b/setup.sh
index 921555a..9ddd646 100755
--- a/setup.sh
+++ b/setup.sh
@@ -614,12 +614,15 @@ if [ "${phpType}" = "tcp" ]; then
                 exit 1
                 ;;
             *)
-                # check port range validity
-                if [ "${inputPHPPort}" -ge 0 ] && [ "${inputPHPPort}" -le 65535 ]; then
+                ## check port range validity
+                # check for letters
+                if [[ "${inputPHPPort}" =~ .*[a-zA-Z].* ]]; then
+                    echo -e "\n${err}Port value must be numeric with no letters${norm}"
+                elif [ ! "${inputPHPPort}" -ge 0 ] || [ ! "${inputPHPPort}" -le 65535 ]; then
+                    echo -e "\n${err}Port must be between 0-65535${norm}"
+                else
                     phpPort="${inputPHPPort}"
                     break
-                else
-                    echo -e "\n${err}Port must be between 0-65535${norm}"
                 fi
                 ;;
         esac