Hi Guys,
Just confirming this issue.
When setting a page rule that involves a “Show if Page is equal to” causes a Trying to get property of Non Object error when “Post Type Order” is activated.
Post Type Order – Activated

Post Type Order – NOT Activated

This is running ACF-Pro 5.1.2
This bug does not appear in 5.0.3 and I think (but I am not positive) that it has been introduced in the last 2 releases.