If you open a console log at the backend, then a browser may write a message
Failed to parse SourceMap: http://website.com/administrator/components/com_widgetkit/plugins/widgets/map_ex/assets/underscore-min.map
This error message doesn't influence or break the functionality of the widget, because the browser just couldn't find the map file for minified version of JS.
If you open a console log at the backend, then a browser may write a message
Failed to parse SourceMap: http://website.com/administrator/components/com_widgetkit/plugins/widgets/map_ex/assets/underscore-min.map
This error message doesn't influence or break the functionality of the widget, because the browser just couldn't find the map file for minified version of JS.