If a BB button module includes a Lightbox click action linked to a ninja form (using a shortcode) and that form includes a repeatable fieldset, you receive an Internal Server Error upon submission. This seems to happen only when you enter content into the fields. If the fields are left blank and the form is submitted without content, the form processes as it should but there is no data returned to the submission eMail, which is to be expected. You can see the problem at https://stmattlutheran.org/directory. If the same form is used inside a BB Ninja Form widget module (see https://stmattlutheran.org/directory2), the form processes correctly and data entered into the form is properly submitted to the submission eMail. Any thoughts as to why this is happening and how this can be made to work inside a Lightbox?