diff --git a/notebooks/LPD/LPD_retrieve_constants_precorrection.ipynb b/notebooks/LPD/LPD_retrieve_constants_precorrection.ipynb
index 21ffbfb4d987be1746abed7145aed2f43850c64b..7dfde91a4fdec82803f954e386b617f347b23008 100644
--- a/notebooks/LPD/LPD_retrieve_constants_precorrection.ipynb
+++ b/notebooks/LPD/LPD_retrieve_constants_precorrection.ipynb
@@ -160,7 +160,7 @@
     "        resp = CalibrationConstantVersion.get_closest_by_time_by_detector_conditions(\n",
     "            client, karabo_id, list(calibrations.keys()),\n",
     "            {'parameters_conditions_attributes': condition},\n",
-    "            karabo_da=k_da, event_at=creation_time.isoformat(), snapshot_at=None)\n",
+    "            karabo_da=k_da, event_at=creation_time.isoformat())\n",
     "\n",
     "        if not resp[\"success\"]:\n",
     "            print(f\"ERROR: Constants {list(calibrations.values())} \"\n",