diff --git a/notebooks/Jungfrau/Jungfrau_dark_analysis_all_gains_burst_mode_NBC.ipynb b/notebooks/Jungfrau/Jungfrau_dark_analysis_all_gains_burst_mode_NBC.ipynb
index 31fb1d431120a2bb5bdee4c2627f821e518ae626..9c2c7086b0303912ab11386dafbe483b5706dbb3 100644
--- a/notebooks/Jungfrau/Jungfrau_dark_analysis_all_gains_burst_mode_NBC.ipynb
+++ b/notebooks/Jungfrau/Jungfrau_dark_analysis_all_gains_burst_mode_NBC.ipynb
@@ -201,7 +201,11 @@
     "        fp_name = path_template.format(r_n, karabo_da_control)\n",
     "        fp_path = '{}/{}'.format(ped_dir, fp_name)\n",
     "      \n",
-    "        n_files = len(glob.glob(\"{}/*{}*.h5\".format(ped_dir, path_inset)))\n",
+    "        files_pattern = \"{}/*{}*.h5\".format(ped_dir, path_inset)\n",
+    "        n_files = len(glob.glob(files_pattern))\n",
+    "        if n_files == 0:\n",
+    "            raise Exception(f\"No files found matching {files_pattern!r}\")\n",
+    "\n",
     "        myRange = range(0, n_files)\n",
     "        control_path = h5path_cntrl.format(karabo_id_control, receiver_control_id)\n",
     "        \n",