Issue with Started Checkout flow sending users to "/none" [Shopify]

Hi there, 

I’ve been looking through a few threads and haven’t found an answer to this question yet. 

Could someone help me figure out why our Started checkout flow emails are sometimes sending people to a “/none” url?

I looked at the activity details for multiple customers that have received the flow under:

Analytics > Metrics > Checkout Started > Activity Feed > the three dots to the right of multiple users > Activity Details > and then I see the following under the “$value” branch: 

"responsive_checkout_url":

NULL

"checkout_url":

NULL

When users receive this URL they just basically get sent to a blank page, not even to our site. 

I’ve tested this and looked at dozens of people’s activity details for the checkout started flow, and it looks like about 30% of them are actually getting a link to their restored cart. The rest are being led to nowhere. 

Do you have any idea why this is happening?

Our Checkout Started flow is setup the default way and hasn’t been changed in over a year. We’re only noticing that this issue started in the last couple of months. 

We recently removed a button that let users go straight to checkout and skip the cart page but that didn’t fix it. 

Do you have any thoughts on this? 

I’d rather not simply just put the {{ organization.url }}/cart​ in because that seems like giving up. 

It seems like the issue is because Shopify is only sometimes getting all of the cart data pushed up to Klaviyo. Maybe our store is too slow? 

Any thoughts or suggestions are welcome.