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4 changes: 4 additions & 0 deletions packages/python/plotly/plotly/express/_core.py
Original file line number Diff line number Diff line change
Expand Up @@ -928,6 +928,10 @@ def build_dataframe(args, attrables, array_attrables):
length = len(df_output)
if argument is None:
continue
# Ensure the field of "custom_data" is always list
if field == "custom_data":
if not isinstance(argument, list):
argument = [argument]
# Case of multiindex
if isinstance(argument, pd.MultiIndex):
raise TypeError(
Expand Down