Here too had the same is_plugin_active() fatal error using Spacious with/without child. Probably also related to the 1.3.8 version update. Verified that 1.3.5 works as expected with woocommerce.
To create the error I simply allowed display of the “Shop” menu. I use “Nav Menu Roles” plugin for this, which allows turning on/off menus dependent on roles you give. A pretty innocuous piece of code. After allowing the “Shop” menu to display and going to the “shop” page I get the error. Doesn’t seem any error with woocommerce, since all their shortcodes are working, which essentially do the same as their shop page. Nor would I suspect Nav Menu Roles since it’s pretty simple.
I’ll turn on the debug mode and look into this but hoping at least two people with the error will trigger some interest.
