I reported this some weeks ago, and made all the solutions and steps, but the problem is not resolved.
I use brizy pro as a page builder. The error you can see it in the attached file. When I load my webpage to see a preview, I press the different menu item links to navigate between the content. So, when I press the forum link, to see the forum itself, appears this error. So I press the back arrow at upleft corner, and then, I press again the forum link in the manu, the forum page appears cortrectly.
Someone say that the problem is with brizy, so brizy team did a review, and said that there are no problem.
Someone say that the problem is the php version, so I downgrade from 8.1 to 8.0
I do not know if there are any solution to this, so I need your help.
Then disable brizly pro and see if the error goes away. Simple as that.
And checking the brizly forum at Wordpress, i see a LOT of issues with that builder. A lot.
Thank you for your help. I tried the solution you did. The problem did not resolve. I post here an image to you to see the problem. The website is online.