Nope. Have your agent do their job and get another lender to qualify the buyer.
An offer is just that, an offer. Until they sign off on contingencies and the loan is funded, it can fall out of escrow even on the 29th day of a 30 day escrow. Lately, lenders are adding on conditions on top of their original conditions and some have flat out refused to fund the loan even when all the conditions have been met.