Media galleries make posts not show up

Beautiful theme! I really hope I can get it working!

My problem is that any of my posts which use a Gallery (Add Media -> Create Gallery) do not show up. You will still see the header and the post title, but no content, and the WordPress toolbar is also absent.

Here is an example of a post with a gallery not showing up.

Here is an example of a post with no gallery working correctly.

When I delete the Gallery from the post, it does work correctly, so I am pretty sure it’s the gallery causing the error. The problem occurs on both the Google Chrome and Mozilla Firefox browsers. I googled the error and found nothing to help.

I would appreciate any help fixing this, as I would be really sad to not be able to use this gorgeous theme!