Fatal Error on Site Due to Plugin – HELP

My site apparently updated some stuff automatically, and something seemed to crash the site. Stating a fatal error when you went to the site and basically just a white page.

This is the theme I’m using: https://themeforest.net/item/the-forester-a-creative-wordpress-theme/20410914

After getting my webhost to fix it with a site backup (as I couldn’t even get into wordpress), it mostly worked again (just one section missing some pictures). When I updated the Elementor plugin, the site crashed again so seemed to be connected to that. It’s currently running again thanks to my web host fixing it with a backup again. And they told me that this is the issue in the error log:

Declaration of Custom_Menu_Wizard_Sorter::walk($elements, $max_depth = 0) should be compatible with Walker::walk($elements, $max_depth, …$args) in /home1/chris461/public_html/wp-content/plugins/custom-menu-wizard/include/class.sorter.php on line 60

I contacted Elementor, who told me to contact the designer (so contacted on Ninetheme on Envato Market), who told me to contact the ‘Custom Menu Wizard Plugin’ support to fix it. Seems there’s no direct contact, only the forum, so hoping to get some solution here.

Is there any way to fix this? Or what am I meant to do? As I can’t seem to update anything now without worrying it’ll crash the site again. I’m not great with web design (I actually rather hate it as one tiny thing always seems to screw the whole site up) or anything to do with customization. So any help at all would be appreciated.