+ A contract between a general contractor and her customer contains the following provision: "The price due to the contractor shall not be payable unless and until AA Architecture LLC [the architect hired by the customer to design the project] has certified that the building has been completed in accordance with the specifications for the project." When the contractor completed work on the building, he learns that the customer fired AA Architecture a month earlier, and as a result no certification can be obtained. Question: In a lawsuit to recover the construction price, the customer argues that her obligation to pay is subject to an express condition that hasn't been satisfied, and therefore she owes nothing. Is she correct?