typescript - Error in sinon when I try to stub getter again -

when try stub getter again, have error:

typeerror: cannot redefine property: cqlfilter     @ function.defineproperty (<anonymous>) 

this part of test code:

const layer = new layer(); const cqlfilterstub = sinon.stub(layer, "cqlfilter"); cqlfilterstub.get(() => "test"); // error occurs in line cqlfilterstub.get(() => null);