I don't know for sure but half a dozen people having the same problem at the same time that started this afternoon points to a shopify problem if you ask me, but it's making Shopify aware that they've got a problem which they may or may not even know...

Others have started having the same problem this afternoon on different themes. I have the same issue on prestige mobile. https://community.shopify.com/c/shopify-design/liquid-error-internal/td-p/1349786I suspect it’s a Shopify problem. 

https://community.shopify.com/c/shopify-design/liquid-error-internal/td-p/1349786others having same problem 

Same issue. Prestige theme mobile