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I am getting these PHP8.0 Warnings from my WordPress site. The warnings are pointing to core code, not anything custom. When I turn debugging on there are no error messages on the site. I also checked the menu and all of the links are accurate. Is anyone able to help me figure out this warning?

[09-Jan-2024 19:21:27 UTC] PHP Warning:  Attempt to read property "ID" on null in \wp-includes\post-template.php on line 674

[09-Jan-2024 19:21:27 UTC] PHP Warning:  Attempt to read property "post_type" on null in \wp-includes\post-template.php on line 675

    if ( is_singular() ) {
        $post      = $wp_query->get_queried_object();
        $post_id   = $post->ID; // Line 674
        $post_type = $post->post_type; // Line 675
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    For some reason the $post variable is missing on a single post template. Does this error appear on particular pages? Are you doing anything unusual in custom code that would affect the $post variable? Are you creating some kind of custom route/endpoint that doesn't point to a post?
    – Jacob Peattie
    Commented Jan 10 at 4:25
  • Ah, it seems the error was showing when you get the 404 error message. I created a custom 404 error page and the error is now gone. Thank you for pointing me in the right direction!
    – Dawn
    Commented Jan 10 at 18:19

1 Answer 1

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The error was occurring when someone hits a page that doesn't exist (404). I created a custom 404 error page and the errors are now gone.

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