Weird Gridder bug won’t let me upload project thumbnails

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Hey! There’s this weird bug that won’t let me upload project thumbnails in a category. I can upload anything else, just project thumbnails won’t work. This is what the browser console gave me:

Uncaught TypeError: Cannot read property 'length' of null
at t.render (gridder.app.min.js?ver=3.3.4:1)
at Ne (react-dom.min.js?ver=3.3.4:103)
at Bh (react-dom.min.js?ver=3.3.4:103)
at Lj (react-dom.min.js?ver=3.3.4:231)
at $h (react-dom.min.js?ver=3.3.4:137)
at Fj (react-dom.min.js?ver=3.3.4:137)
at We (react-dom.min.js?ver=3.3.4:132)
at react-dom.min.js?ver=3.3.4:60
at unstable_runWithPriority (react.min.js?ver=3.3.4:25)
at pb (react-dom.min.js?ver=3.3.4:59)

Have you guys got any idea what could be wrong? I can give you access to the WP-Admin Panel if you need …

Thanks in advance!

Max

@Max-Weinland @mariusjopen @arminunruh Do you guys know anything? My client can’t make an urgent update to their website like this and I would like to let her know what’s up and when things can get moving again …

Thanks!

Dear @Max-Weinland
Can you post a link to your website?
We will then have a look and inspect that!
Many wishes!
Marius

http://juliesinios.com/

Dear @Max-Weinland
I can see the thumbnails.

Best is if you write me a Private Message and include your username, password to your Wordpress Admin panel and a link to this conversation.
Many wishes!
Marius