A California appellate court on Thursday tossed an arbitration ruling that Seyfarth Shaw won for JPMorgan Chase Bank N.A. citing the arbitrator’s failure to disclose at least four other arbitrations involving the firm’s lawyers.

In a 30-page published opinion, a unanimous three-judge panel of the Second District Court of Appeal in Los Angeles found that their retired colleague Candace Cooper failed to provide litigants with a page of a required 11-page questionnaire in the run-up to the American Arbitration Association proceeding. Additionally, the panel found that Cooper, who isn’t identified by name in the decision, failed to provide required notice to the parties about four separate arbitrations she was handling that involved Chase’s law firm, Seyfarth Shaw.