diff --git a/content/FLAIR-GG/count.ipynb b/content/FLAIR-GG/count.ipynb
index ea25737..9f65213 100644
--- a/content/FLAIR-GG/count.ipynb
+++ b/content/FLAIR-GG/count.ipynb
@@ -57,6 +57,7 @@
    "source": [
     "import io\n",
     "import array\n",
+    "import sys\n",
     "\n",
     "key = \"XXXXXXXXX\"   # your secret key from the FLAIR-GG Virtual Platform\n",
     "\n",
@@ -64,6 +65,10 @@
     "url = \"https://bgv.cbgp.upm.es/DAV/home/LDP/{}\".format(key)\n",
     "\n",
     "\n",
+    "if key == \"X\":\n",
+    "    sys.exit(\"you didn't change the key!\")\n",
+    "\n",
+    "\n",
     "response = requests.get(url)\n",
     "response = json.loads(response.content)\n",
     "# print(response)\n",