num_regression is throwing exceptions when it receives a list of objects

[csantosss]

This problem started to occur after adding the dataframe_regression fixture.

[csantosss]

num_regression = <pytest_regressions.num_regression.NumericRegressionFixture object at 0x00000221380F7A58>
    def test_torque_drag_work_string(num_regression):
        work_string = BuildWorkString(WellType.SPE_84246)
>       num_regression.check(CheckWorkString(work_string))
E       AssertionError: Only numeric data is supported on dataframe_regression fixture.
E         Array with type 'object' was given.
E         
E       assert dtype('O') not in ['m', 'M', 'O', 'S', 'a', 'U', ...]
E        +  where dtype('O') = 0     WorkStringElementType.Pipe\n1     WorkStringElementType.Pipe\n2     WorkStringElementType.Pipe\n3     WorkStringEle...pe.Pipe\n15    WorkStringElementType.Pipe\n16    WorkStringElementType.Pipe\nName: work_string_element_type, dtype: object.dtype
source\python\welllib\sim\_tests\test_torque_drag_base_structure.py:103: AssertionError