Labour's chair has apologised for accidentally voting for a managed no deal as part of the series of indicative votes in the House of Commons.
Ian Lavery angered Remain-supporting Labour members by choosing an option but forward by Tory Marcus Fysh.
The Wansbeck MP was down on the official House of Commons record as having voted for the so-called managed no deal option.
The party has said that it was a mistake and that Mr Lavery has a track record of opposing no deal.
Speaking to HuffPost UK, Mr Lavery said the mistake was his and not whips’ or House of Commons staff’s, but added: “I hold the opposite views, as everyone is aware.”
Labour have consistently opposed a no deal Brexit with Mr Corbyn repeatedly asking the Prime Minister to take it off the table.
On Wednesday MPs took the unusual step of choosing a number of different Brexit options on a paper ballot paper.
The 'managed no deal' option would involve the UK making its budgetary contributions to the EU to the end of 2020 and agrees with the EU a period of two years in which UK goods have full access to the EU.
Brexit: Second referendum blocked by just a handful of Labour MPs
Pro-EU Labour campaigner Fiona O’Farrell told HuffPost UK: “I would expect the chairman of the Labour Party to make sure that he had taken the time to read what was on his ballot paper and know what he was voting for.
“Mistakenly voting for a no-deal, which would be a disaster for the people of this country, is just not acceptable.”
Mr Lavery is one of three members of the shadow cabinet to defy the whip and asbstain on the motion for a second referendum.
Andrew Gwynne and shadow cabinet minister Jon Trickett also abstained as did a number of shadow ministers including Tracey Brabin and Mike Kane.
But shadow housing minister Melanie Onn resigned in order to vote against.
Emma Lewell-Buck and Justin Madders had to resign from the frontbench when they voted to block a second vote earlier in the month.
The option for a second referendum lost by just 27 votes - meaning that if just a handful of Labour MPs had supported it then it could have passed.
