Menu collapses when trying to expand submenu

When using the collapsable menu for small screen, if you have a menu item that has child items, you cannot use the child items. When you click the parent item, the entire menu collapses when the child menu should expand. I corrected the javascript error. Can you please also fix this in the official version, so I won't lose my fix when there's an update?

I attached the bootstrap_agency.js file (I had to rename it to txt to upload it)? As you can see in the file, I replaced
$('#navbar .navbar-collapse ul li a').click(function()
with
$('#navbar .navbar-collapse ul li:not(.dropdown) a').click(function()
so menu items with class dropdown don't trigger the collapse of the menu.