iPad page with megaslider reload due to error

The issue can be found here: https://zelfontspanners.nl click slideshow
The preview works: Yes
It works with other themes: Haven’t Tried
It works when I disable all other plugins: Haven’t Tried
Meta Slider version: 3.3

Seems to be related to Flexslider.

The page I need help with: [log in to see the link]