🇺🇸United States @ljwilson

Looks like multiselect 2.0.0-beta4 r changed some var variables to constants. For the error above, try changing the const to let for the $submit in line 11 of multiselect.js (with the patch already applied, of course).

That worked for me.

I've attached a re-rolled version of #6 which includes this one-word change.