Conflict with Real Media Library

I think I just found a conflict with another plugin, WP Real Media Library.

I have added a file_advanced field to a meta box. Then I selected an .mpg file from the media library. When I edit this post again, the file is not listed (just empty space next to the label). In the developer console I get this JavaScript error:

TypeError: this.$input.data(...).map is not a function
media.js:129:51
    initialize http://localhost/wp/wp-content/plugins/meta-box/js/media.js:129
    Backbone 2
    initMediaField http://localhost/wp/wp-content/plugins/meta-box/js/media.js:546
    jQuery 2
    <anonymous> http://localhost/wp/wp-content/plugins/meta-box/js/media.js:552
    jQuery 4

and after that, a warning:

Source map error: request failed with status 404
Resource URL: http://localhost/wp/wp-content/plugins/real-media-library/public/lib/es7-shim/dist/es7-shim.min.js
Source Map URL: dist/es7-shim.map

When I disable WP Real Media Library, everything works as expected.