A group of FTX U.S.-based employees stumbled across a backdoor for its affiliated trading firm Alameda Research months before the crypto exchange collapsed in Nov. 2022, the Wall Street Journal reported, citing people familiar with the matter.

The backdoor allowed Alameda to have a negative balance of up to $65 billion using customer funds, according to previous court filings revealing code buried in FTX’s systems. Negative balances were not possible for other FTX users, who would be automatically liquidated if they fell into the red.

The employees reportedly alerted their division boss to the discovery, who discussed it with former FTX CEO Sam Bankman Fried’s lieutenant Nishad Singh, but the issue was never resolved. Instead, the leader of the team who raised the concern was sacked, …