Rogier

Hello Mike,

Deactivate the floating ShareThis plugin with the social icons was the solution.

Thanks for the help!

Rogier

Hello,

You can see it when you open the website on a tablet or when you make the screen of your browser a little bit smaller than normal. The sidebar wil dissappear at that moment and the only thing you see is >>> to open the sidebar.

When you click on the >> to open the sidebar you get the “undefined” page

Resolved: jQuery update did the trick.