Mobile Menu Has Stopped Working

Hello all !

The burger icon on my website has stopped working on some phones. It appears to register a finger tap, but wont open to show the full menu. I am not sure if this is related to a forced WordPress update or changes to site content, as both have happened recently.

Inspect > Console shows this error when I am logged in:
Uncaught SyntaxError: unexpected token: ‘)’

image: https://imgur.com/a/ZjmzbvA

Turning off ‘Minify Javascript’ in my Speed Optimizer Plug-in makes the error disappear, but does not fix the issue. If there is a stray ‘)’ in my code that needs to be fixed, I am not sure how to best locate and edit this.

Other notes:

• I am using the Bjork theme and Gutenberg
• burger works on some smart phones and not others
• burger works as expected on PC

thanks for your help!

Tony

The page I need help with: [log in to see the link]