trying to get property of non-object notice

That is indeed strange. Sometimes strange behavior may be caused by a plugin or theme conflict. The fastest way to rule out conflicts is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Seventeen. If this resolves the issue, you have a conflict and should activate one plugin at a time until you locate the conflict. Finally, after all plugins are active, switch to your theme. This will narrow down the conflict to a specific plugin or theme.

If you are unfamiliar with checking for conflicts, we wrote a small guide that will walk you through the steps. You can find it here: How To Check For Plugin Conflicts

Thank you for your response, I’ll troubleshoot it today.

im having similar issues, after creating a new page and i press update, i see this:

Notice: Trying to get property of non-object in /var/www/vhosts/vps-281860-5378.hosted.at.hostnet.nl/blitzbrokers.com/wp-includes/nav-menu.php on line 728
Are you sure you want to do this?

Please try again.

@turbotrader If you have a similar issue, please open a new request. That way it’s easier to track issues and provide assistance. Thanks!