Plaintiff, who was not a licensed real estate agent or broker, adequately alleged facts that could give rise to an estoppel to plead the statute of frauds as a defense to her claim for breach of an oral contract to pay her a finder’s fee in connection with the sale of real property. Plaintiff alleged that in reliance on the oral promise of a finder’s fee she postponed her college education for a year to engage in efforts to locate a buyer for the property.