View Category > Click product details = Blank page

I recently installed eShop and started to use it.
Everything appeared to be going well.

I can click on a category and view the products, add to cart, etc.
However, when I click the product name to view the details page, all I get is a blank screen.
View source = blank.
Joomla error reporting = developer > no results.
Nothing is showing up in the php error logs.

Where should I start with debugging this?

Hello Sam,

Sound like this is an outstanding issue. Please submit a new ticket to EShop category to send me the site information so I can help you to check and resolve it.

Hope to hear back from you soon.
Sincerely, Giang

Thank you.
I upgraded to 1.4.0 and it fixed the issue.

No problem at all Sam!
Have a nice weekend!
Sincerely, Giang

I'm having this problem with 1.4.2 now

Hello William,

Seem I received your support ticket regarding this issue. Please following up the ticket system to get my supports.

Sincerely, Giang