diff --git a/stand.py b/stand.py
index 39d9eff..89497b0 100755
--- a/stand.py
+++ b/stand.py
@@ -51,10 +51,10 @@ def update_adb(evt):
 
     pgroup = evt.args["context"]["pgroup"]
     index = evt.args["data"]["index"]
-    index = datetime.fromisoformat(index) # nicegui converts datetime to str
     col_id = evt.args["colId"]
     new_val = evt.args["newValue"]
 
+    index = datetime.fromisoformat(index) # nicegui converts datetime to str
     df = lib.read(pgroup, date_range=[index]).data
     df.at[index, col_id] = new_val
     lib.update(pgroup, df)