Error saving the translations

I saw the same error in a user that post this message: https://ww.wp.xz.cn/support/topic/error-translating-or-importing-language/

It seems that the error was corrected. However, I have the same error and my plugin version is 2.4.9

I would appreciate if you can take a look at it. I have tried to put the translation typing by myself and through a translated csv, but both of them, when I click on Save, all the translations dissappear.

The page I need help with: [log in to see the link]