Instagram Gem, how do I handle an incorrect access token?

@token  = 'xXxXxX...'
@client = Instagram.client(access_token: @token)

begin
  user = @client.user
  # YOUR LOGIC HERE
rescue Instagram::BadRequest => e
  if e.message =~ /access_token provided is invalid/
    # ACCESS TOKEN IS NO LONGER VALID
    # DO SOMETHING E.G. SEND THE USER AN EMAIL
  else
    # IT RETURNED 400 FOR ANOTHER REASON
  end
end