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 28d3a4d32003150689f13524778cc08f75a7fab4..fbfd75df4402fe8609899ff455386543937eae66 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
@@ -302,7 +302,7 @@
     "\n",
     "            # Identify cells/trains with images of 0 pixels.\n",
     "            # TODO: An investigation is ongoing by DET to identify reason for these empty images.\n",
-    "            nonzero_adc = np.where(np.mean(thiscell, axis=(0, 1))!=0)[0]\n",
+    "            nonzero_adc = np.mean(thiscell, axis=(0, 1)) != 0\n",
     "\n",
     "            # Exclude empty images with 0 pixels, before calculating offset and noise\n",
     "            thiscell = thiscell[..., nonzero_adc]\n",