Sidebar+/Bookmarks completely empty after enable the addon

[AX-Turbo]

Hi,

after I´ve enabled the addon, the sidebar+/bookmarks list is just completely empty. Screenshot https://imgur.com/a/2yIxZxC

Regular sidebar is working smoothly, no other sidebar addons, Firefox 60.3.0 ESR, Sidebar+ 0.5.17

[zluca]

Any tips from console? Use ctrl+shift+J to see it.