Syntax error - unexpected token ; on fresh, standard Barrio install

Just installed Drupal 8 (Feb 21, 2018), then installed Bootstrap 4 libs, then the Barrio theme (which uses B-4), following exactly the instructions. I did then install and enable a bunch of modules/extensions and libraries for other functionality.

After creating a fixed-top menu with two links, nothing shows up. Block layout is configured with just branding and main-nav in the header. Inspecting the page in Chrome I see an uncaught syntax error ("unexpected token ;") which appears to be in the default script listed below.

If I switch to the regular Bootstrap 3 theme, all looks fine.

sites/default/files/js/js_rjF70ewJ9lGJUCw4AtaaNe-rVZz3njFLpA3nPsUP7ng.js

I attached an image of the error.

I'm assuming this is Barrio issue, since the code with the unexpected ";" references the Drupal.behaviors.boostrap_barrio_affix function.

Annoying, since this is fresh, released production version and out of the box I get essentially a "fatal" error.