Address #12939

mne-tools · Nov 4, 2024 · 5cd646b · 5cd646b
1 parent 83af2ed
commit 5cd646b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mne/epochs.py b/mne/epochs.py
@@ -3232,7 +3232,7 @@ def _diff_input_strings_vs_event_id(input_strings, input_name, event_id):
 
     # keep_first and keep_last names
     start_idx = stop_idx
-    metadata[columns[start_idx:]] = ""
+    metadata[columns[start_idx:]] = None
 
     # We're all set, let's iterate over all events and fill in in the
     # respective cells in the metadata. We will subset this to include only