An attribute is added to an href of a non-media link

If a user adds an external link, then an attribute of media_library ="Media Library" is added to the href. This breaks the url, because Drupal appends it to the site domain. I looked into the code of the module and it seems thats is the form name of the interface button.

Steps to reproduce:

1. Select text on a page and click the link button
2. Type in a random url into the linkit dialogue box and save