diff --git a/example-script/info.json b/example-script/info.json
index dd3549e..ca48873 100644
--- a/example-script/info.json
+++ b/example-script/info.json
@@ -1,6 +1,6 @@
 {
   "name": "Example script",
-  "identifier": "example-script",
+  "identifier": "example-scriptX",
   "script": "example-script.qml",
   "version": "0.0.1",
   "description" : "Use this script to start a new script you want to submit to the script repository.\\n\\nJust copy the whole 'example-script' folder and rename it and also the 'example-script.qml'"
diff --git a/run-tests.php b/run-tests.php
index 2e50152..b8bf474 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -39,8 +39,11 @@ class TestHelper {
             $errors[] = "No name was entered!";
         }
         
-        if ($data["identifier"] == "") {
+        $identifier = $data["identifier"];
+        if ($identifier == "") {
             $errors[] = "No identifier was entered!";
+        } elseif (preg_match('/[^a-z0-9]/', $str)) {
+            $errors[] = "Invalid charactes were found in identifier '$identifier'!";
         }
         
         if ($data["description"] == "") {