Estoppel is an exception to the nemo dat quod non habet rule.

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Estoppel is a legal principle that precludes a person from denying or asserting something contrary to what they had previously stated or represented to be true. In the context of nemo dat quod non habet (no one can give what they do not own), estoppel can be used as an exception when a person who is not the rightful owner of a property transfers it to a third party with the apparent authority to do so. In such cases, the third party may acquire a valid title to the property, even if the transferor did not have the legal right to do so.

Estoppel Is an Exception to the Nemo Dat Quod Non