Meta Box

The code which is causing this problem is:

savePost( object );
return;

The solution is (tested):
return savePost( object );

Location: https://github.com/wpmetabox/meta-box/blob/5.9.0/js/validation/validation.js#L230

The problem Jan (26-01-21) speaks about is still occurring for me as well. The need for a fix is urgent because our customers are using this field regularly.

Hi,

I am experiencing the exact same problem. I noticed this issue in one of my sites after I updated WordPress to 5.3.

To reproduce this I did a clean install of WordPress 5.3, theme twentytwenty and ONLY the metabox.io plugin. I created an image_advanced field and tried to edit an image. I recorded the issue and I did get an error in my console.

I don't see any options to include the recording here, so I will send this in a seperate support ticket.

What are your ideas on how to fix this?

Is the solution to this problem fix in the newest metabox version 4.18.2?

We too experience performance issues when having multiple uploads/images in the admin editor.