From 9c1158fca057aa737e35b84c4439eb58e4f5f170 Mon Sep 17 00:00:00 2001
From: MarsMellow <mpzwiers@gmail.com>
Date: Fri, 22 Sep 2023 13:49:38 +0200
Subject: [PATCH] Minor bugfix

---
 bidscoin/bids.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bidscoin/bids.py b/bidscoin/bids.py
index 863ed3b7..a691cc37 100644
--- a/bidscoin/bids.py
+++ b/bidscoin/bids.py
@@ -2011,7 +2011,7 @@ def addparticipant(participants_tsv: Path, subid: str='', sesid: str='', data: d
     data_added = False
     if subid:
         if subid not in table.index:
-            table.loc[subid] = None
+            table.loc[subid, 'group'] = None
         if sesid and 'session_id' not in data:
             data['session_id'] = sesid
         for key in data: