Bug - upload custom images

Hello,

When i upload images in custom images, images not show and soon i have popup "Your session has expired. Please log in again and retry this action.", when i log in again, i in content tab, popup again "Your session has expired. Please log in again and retry this action.". When i deleted image, system normal.

Please help.

I didn't find the right solution from the Internet.

References:-

https://bit.ly/2ISzgwS

Blockchain Marketing

Thanks!