Edit text and insert text doesn't work

[SaraVM]

Hello!

I'm trying to change some words of a text and and add another text in a website ninaamat.com
And when the text pop-up appears, I can not do anything, it's a white screen, it's rare (it's been a while since I tried to put text on this website)

I open it with chrome version 80.0.3987.163.

Do you know what happens and how can I fix it?

Thanks in advance for the answer!

[mariusjopen]

Dear @SaraVM
Do you have any third-party plugins installed or CUSTOM JS code? Is it possible to deactivate it for a moment to see if the problem remains?
Many wishes!
Marius