Hello,
Testing on DW 9.16.4 - Swift v1.24 - https://cleanswift.mydwsite1.com/
We found some template errors on the Monitoring tool. Here are the repro steps.
1 - Backend login
2 - Go to Content -> Products -> Details
3 - Click "Show Page"
Page Renders without any error
Monitoring tools shows a couple of errors
Possible fix - Add an addicional check for product.id != null in templates that have a product.
Thank you.