Composite Products error

Recently I have been having a strange error with my site. Whenever I click the select button to choose a component, this error pops up in the console:

Uncaught TypeError: _.pluck is not a function
    at d.WC_CP_Scenarios_Manager.get_strictly_matching_scenarios (add-to-cart-composite.min.js?ver=7.1.2:formatted:4366)
    at d.WC_CP_Scenarios_Manager.calculate_active_scenarios (add-to-cart-composite.min.js?ver=7.1.2:formatted:4303)
    at d.WC_CP_Scenarios_Manager.update_active_scenarios (add-to-cart-composite.min.js?ver=7.1.2:formatted:4210)
    at d.WC_CP_Scenarios_Manager.selection_changed_handler (add-to-cart-composite.min.js?ver=7.1.2:formatted:4192)
    at Object.do_action (add-to-cart-composite.min.js?ver=7.1.2:formatted:3929)
    at d.WC_CP_Actions_Dispatcher.do_action (add-to-cart-composite.min.js?ver=7.1.2:formatted:4053)
    at i.<anonymous> (add-to-cart-composite.min.js?ver=7.1.2:formatted:3940)
    at p (backbone.min.js?ver=1.4.0:2)
    at f (backbone.min.js?ver=1.4.0:2)
    at l (backbone.min.js?ver=1.4.0:2)

I am completely stumped as to why this happens. I have deactivated all my plugins and still the problem persists. The interesting thing is, when I clear my browser cache, refresh the page, and click the select button, it works… once. After I refresh or visit the page again, the problem resumes

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