The navigation (hamburger) on mobile doesn't work (works on desktop)

[Przytula]

https://powerhouselithium.com/

If anyone could help, you'd be a lifesaver. 

The  hamburger menu is not opening on mobile and I'm not sure what the issue is.

I used Google to inspect the page and is shows that this line is causing issues (although it could totally be something else).

 cache.$window.on('scroll.stickynav', $.throttle(15, stickyHeaderOnScroll));

I'm using the Venture theme.

Thanks in advance

[Przytula]

Here is additional code...

storeifyapps-formbuilder-script.js?v=28450164374491247021691802447:1 JQMIGRATE: Migrate is installed, version 3.1.0

jquery-migrate-1.4.1.min.js:2 JQMIGRATE: Migrate is installed, version 1.4.1
theme.js:2354 Uncaught TypeError: $.throttle is not a function
    at Object.init (theme.js:2354:44)
    at new Header (theme.js:2661:24)
    at theme.Sections._createInstance (theme.js:30:31)
    at theme.Sections.<anonymous> (theme.js:109:14)
    at Function.each (jquery-2.2.4.js:365:19)
    at a.fn.init.each (jquery-2.2.4.js:137:17)
    at theme.Sections.register (theme.js:107:43)
    at theme.init (theme.js:3840:12)
    at c (vendor.js?v=59352919779726365461691802447:14:6580)
    at Object.fireWith [as resolveWith] (vendor.js?v=59352919779726365461691802447:14:7348)

Any help would be amazing and appreciated.

[Przytula · Accepted solution]

I kinda figured it out.