error

Exception
    NoMethodError
Error
    undefined method `id' for nil:NilClass

    /home/gitlab/gitlab/app/models/project.rb:104:in `find_with_namespace'
    /home/gitlab/gitlab/app/workers/post_receive.rb:9:in `perform'

post_receive.rb

class PostReceive
  @queue = :post_receive

  def self.perform(repo_path, oldrev, newrev, ref, identifier)
    repo_path.gsub!(Gitlab.config.gitolite.repos_path.to_s, "")
    repo_path.gsub!(/.git$/, "")
    repo_path.gsub!(/^\//, "")

    project = Project.find_with_namespace(repo_path)
    return false if project.nil?

    # Ignore push from non-gitlab users
    user = if identifier.eql? Gitlab.config.gitolite.admin_key
      email = project.commit(newrev).author.email rescue nil
      User.find_by_email(email) if email
    elsif /^[A-Z0-9._%a-z\-]+@(?:[A-Z0-9a-z\-]+\.)+[A-Za-z]{2,4}$/.match(identifier)
      User.find_by_email(identifier)
    else
      Key.find_by_identifier(identifier).try(:user)
    end
    return false unless user

    project.trigger_post_receive(oldrev, newrev, ref, user)
  end
end
~

project.rb

 def find_with_namespace(id)
      if id.include?("/")
        id = id.split("/")
        namespace_id = Namespace.find_by_path(id.first).id
        where(namespace_id: namespace_id).find_by_path(id.last)
      else
        where(path: id, namespace_id: nil).last
      end
    end