[Python] error: "get" is not a known attribute of "None" (reportOptionalMemberAccess)

I use PyRight to check my Django code. It complains about that


class FooForm(ModelForm):

def clean(self):
cleaned_data = super().clean()
start = cleaned_data.get("start_date") # <------- here

error: "get" is not a known attribute of "None" (reportOptionalMemberAccess)
​

I installed django-stubs.

How to make PyRight aware that cleaned_data is a dictionary?

Or is something wrong with my setup?

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