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2 changes: 1 addition & 1 deletion cdisc_rules_engine/check_operators/helpers.py
Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ def default_value(self):


def is_valid_date(date_string: str) -> bool:
if date_string is None:
if date_string is None or not isinstance(date_string, str):
return False
try:
isoparse(date_string)
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