After an update to Joomla 3.8.10 I am getting errors and I cannot use the menu.
I did a fresh install to test and everything was O.,K. until I installed a Joomshaper template - I tried Spectrum and Educon and both templates caused the error. When I uninstalled the templates and SP Page Builder the error stayed.
In the test site if I disable the plugins Helix3-Ajax and System helix3 Framework the menu will start to work again - but on 2 other sites if I disable the plugins nothing happens. And since they are live sites I don't want to screw around with them too much.