regrep: fatal error
A:
I had the same problem and I solved it by installing the command-line version of V8 (google had an easy way to do it) and then using the command below to re-install node.js, which helped me to solve the problem.
curl -sL  | sudo -E bash -
sudo apt-get install -y nodejs
Q:
Spree 3 - Create multiple checkout sessions from request.env['HTTP_REFERER']
I am having problems with the Spree checkout, and I cannot find anything useful when searching the forums and other sources. 
Basically I want to create a scenario where a user has an initial session that fills out a lot of information and allows them to proceed with the checkout process, and then when they leave the checkout, they return to the page and continue with the checkout flow from where they left it.
I've tried returning to the checkout with this in my 'after_sale' controller, but it seems to be resetting the session and the return path, so it seems to be what's causing the problem.
    if current_user
      checkout_user_sessions(user)
      redirect_to checkout_path
    else
      redirect_to new_checkout_session_path
    end
I tried creating a new user, so that there were two sessions created, one for the new user, and one for the initial user and it still wouldn't work. 
The third idea I had was to create a new session for the new user and save some information in that session that the initial user could then use to continue the checkout, but that still didn't work. 
Does anyone know how to solve this problem?
It is a little bit late, but I had the same problem and used the following snippet to make the return:
# an empty string will return you back to the checkout
redirect_to checkout_path, method: :get, params: { return_to: '' }
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