Actually, it should not call any theme files if another theme is active. Anyway, we have added an additional check for XStore Core plugin functions to prevent calling xstore theme functions if XStore theme is disabled. Also, you can try to disable the XStore core plugin once you got the error again and check if the disabling of the plugin helps you.
Ok I sent your message to the app plugin maker. I did try turning off the core and the app seemed to work. Obviously the site didn’t look good. But once I turned the xstore core on again the app product pages broke. By the way it only breaks on the product pages. On the site as in the video I sent you it just loads the product and shopping pages funny. When the error happens. The rest of the site does not have any errors on the app or the site. At least that I can see.
No didn’t change anything. I do notice that there are two xstore core plugins installed now only one active. Not sure if you did that? Anyway as the video showed you should be able to see the issues. My hosting company, me, the app plugin owner and my customers can see it so you should be able to see it on your end.