The CSP issue that has been fixed in release [v1.7](https://github.com/softsimon/ngx-bootstrap-multiselect/releases/tag/v1.7) still exists in the latest version (v2.1.1). Please refer to the original issue: https://github.com/softsimon/ngx-bootstrap-multiselect/issues/387
