diff --git a/05_Agents/01_create_agent.ipynb b/05_Agents/01_create_agent.ipynb
index 9cb9268e..054d92c6 100644
--- a/05_Agents/01_create_agent.ipynb
+++ b/05_Agents/01_create_agent.ipynb
@@ -316,7 +316,7 @@
     "    \"\"\"\n",
     "    Get a parameter from the lambda event\n",
     "    \"\"\"\n",
-    "    return next(item for item in event['parameters'] if item['name'] == name)['value']\n",
+    "    return next((item for item in event['parameters'] if item['name'] == name),{}).get('value', None))\n",
     "\n",
     "\n",
     "def get_booking_details(booking_id):\n",