diff --git a/superset/commands/dataset/update.py b/superset/commands/dataset/update.py
index 300506fdfbf4b..458d17d3d8555 100644
--- a/superset/commands/dataset/update.py
+++ b/superset/commands/dataset/update.py
@@ -143,7 +143,7 @@ def _validate_columns(
             # validate python_date_format is ISO8601 format
             for col in columns:
                 if not DatasetDAO.validate_column_pdf_is_iso8601(
-                    col["python_date_format"]
+                    col.get("python_date_format", None)
                 ):
                     exceptions.append(DatasetColumnsConstraintsValidationError())