Customers pulled funds from Crypto.com over the weekend after the company’s chief executive said the cryptocurrency exchange mishandled a roughly $400m transaction.

Crypto.com chief executive Kris Marszalek said on Twitter that the transfer was sent to the wrong type of account on another exchange. The transfer of a large chunk of ether, a popular cryptocurrency, took place on 21 October, but came to light after Twitter users flagged the transfer as unusual, based on publicly available blockchain transaction records.