Widget breaks if you don't insert content

Hey,

great plugin but I discovered some sort of bug:

If I add the widget and hit save in the TinyMCE editor without inserting any content before the editor breaks.

Firebug says: “detailed error: NS_ERROR_UNEXPECTED: ” at http://localhost/wordpress/wp-includes/js/tinymce/wp-tinymce.php

Any chance you can reproduce this error?

Thanks,
Florian

https://wordpress.org/plugins/hc-text-widget/