diff --git a/product/ERP5Type/Accessor/Base.py b/product/ERP5Type/Accessor/Base.py index 14b0681b7d1e4a85bd2aecadad8e7eeb327fd9ea..03ca8d4ca50e6ac275afd41d31aeb26fa6abef0e 100644 --- a/product/ERP5Type/Accessor/Base.py +++ b/product/ERP5Type/Accessor/Base.py @@ -188,4 +188,4 @@ class Tester(Method): self._storage_id = storage_id def __call__(self, instance, *args, **kw): - return getattr(aq_base(instance), self._storage_id, None) is not None + return getattr(aq_base(instance), self._storage_id, None) not in self._null