A former FTX client has filed a lawsuit against hedge fund Olympus Peak, accusing it of failing to honor its commitment to pay an additional amount on a bankruptcy claim it sold.

Alexander Nicholas Girchick claims he agreed to sell the $1.59 million claim at a 42% discount, subject to an additional payment if the claim was exceeded.

According to documents filed in the U.S. District Court for the Southern District of New York, Olympus Peak has refused to honor the deal, despite recent statements from FTX that it could pay up to 146% of the claim.

Olympus Peak did not respond to a request for comment.