Where, in an action for broker's commissions for procuring a purchaser of real estate, the issue was whether plaintiff had been employed to procure a purchaser, the admission in evidence of a contract of sale drawn in the absence of plaintiff, stating that the seller and purchaser agreed that no broker had brought about the sale, and that no commission was to be paid to the broker, was prejudicial to plaintiff. Koch v. Bjor-kegran, 119 N. Y. S. 193.