Bug Nonce is invalid error

Dear wpDiscuz Team,

I was asked by your team to open a new thread on this forums, after the one I started on wordpress plugin support forums was not resolved.

As per the title of this thread, I am reached out by users telling me they are unable to post their comments on my website. I tried it myself as an admin, and I am getting the “Nonce is invalid” error. This is most likely goes back since mid OCTOBER 2025, as since then I was unable to see any new comments from my users. 

I was offered by your team to add the below filter:

add_filter(“wpdiscuz_validate_nonce_for_guests”,”__return_false”)

I have used code snippets to add the filter, however, it did not work. Although I am not a code expert, I assume there be some function code included along to use with this filter (see attached image)

Please advise how to resolve this issue, as everything was working perfectly in the past and I am not sure what step to take next ( I also searched for previous similar topics, but they were not helpful in my case).

Thank you and kind regards,