javascript error

Custom Sidebars plugin is causing a javascript error in the following situation:

When another plugin (in my case Admin Columns) is showing a notice in the plugin settings pages, with a ‘hide this notice’ button, the notice button cannot be clicked away and the page itself has the following javascript error in Console:

ReferenceError: wpmUi is not defined
var modal = wpmUi._make_modal( ‘light’ );

or (depending on the page)

ReferenceError: Can’t find variable: wpmUi

When I disable Custom Sidebars plugin, the javascript error goes away, and clicking the Hide Notice button works as expected.

https://wordpress.org/plugins/custom-sidebars/