While assigning Predicate to any date except current date. Getting Exception- 'Null' is not a subtype of type 'num'<…>

[jashan55]

Describe the bug
I am simply trying to query the cardiogram with the following Predicate

final results = await HealthKitReporter.electrocardiogramQuery(
Predicate(
DateTime.now().add(Duration(days: -7)),
DateTime.now(),
),
withVoltageMeasurements: false,
);

it returns - Exception 'Null' is not a subtype of type 'num'<…>

instead of previous date, if I pass the current date it is executing.

Expected behavior
Expected behaviours is list of Electrocardiogram between the given dates.

[jashan55]

Is there any other way to get all ECG's without providing predicate? I think there is nil option in health kit native query. Do we have that implementation here?