diff --git a/notebooks/Timepix/Compute_Timepix_Event_Centroids.ipynb b/notebooks/Timepix/Compute_Timepix_Event_Centroids.ipynb
index 65907c8db49c1f52972c305af250d6f1fd886dc2..3f745559cbfce6a17746c2010ce285c7d5ea2bd7 100755
--- a/notebooks/Timepix/Compute_Timepix_Event_Centroids.ipynb
+++ b/notebooks/Timepix/Compute_Timepix_Event_Centroids.ipynb
@@ -284,7 +284,7 @@
    "outputs": [],
    "source": [
     "dc = RunDirectory(Path(in_folder) / f'r{run:04d}', inc_suspect_trains=True)\n",
-    "proposal = list(filter(None, in_folder.strip('/').split('/')))[-2]\n",
+    "proposal = list(filter(None, in_folder.strip('/').split('/')))[-2] if proposal=='' else proposal\n",
     "base_path=find_proposal(proposal)\n",
     "\n",
     "if raw_timewalk_lut_filepath:\n",