I would remind members, and in fact the member for Timmins—James Bay is correct, that members must stay in the House in their seats during the vote. If a member leaves during the middle of a vote, before the result has been declared, then his or her vote cannot count. That was the case, in fact, in relation to the Minister of Employment and the member for Foothills on that particular vote.
In the House of Commons on June 14th, 2018. See this statement in context.