Nick H.

Got it! I restored a backup to downgrade WordPress and everything’s cool now!

So it’s a 4.9.2 issue.

Whoops! Thought I still had my thread open and replied to the wrong one. Sorry!

• This reply was modified 8 years, 4 months ago by Nick H..

I used the patch listed on this thread and it worked:
https://ww.wp.xz.cn/support/topic/warning-after-the-upgrade-to-wp-44/page/2?replies=50

To fix, open your category-template.php and replace lines 1144 – 1158…

function get_the_terms( $post, $taxonomy ) {
	if ( ! $post = get_post( $post ) )
		return false;

	$terms = get_object_term_cache( $post->ID, $taxonomy );
	if ( false === $terms ) {
		$terms = wp_get_object_terms( $post->ID, $taxonomy );
		$to_cache = array();
		foreach ( $terms as $key => $term ) {
			$to_cache[ $key ] = $term->data;
		}
		wp_cache_add( $post->ID, $to_cache, $taxonomy . '_relationships' );
	}

	$terms = array_map( 'get_term', $terms );

…with the new code from the patch:

function get_the_terms( $post, $taxonomy ) {
	if ( ! $post = get_post( $post ) )
		return false;

	$terms = get_object_term_cache( $post->ID, $taxonomy );
 	if ( false === $terms ) {
 		$terms = wp_get_object_terms( $post->ID, $taxonomy );
		if ( ! is_wp_error( $terms ) ) {
			$to_cache = array();
			foreach ( $terms as $key => $term ) {
				$to_cache[ $key ] = $term->data;
			}
			wp_cache_add( $post->ID, $to_cache, $taxonomy . '_relationships' );
 		}
 	}

	if ( ! is_wp_error( $terms ) ) {
		$terms = array_map( 'get_term', $terms );
	}

So is now line 1144 – 1162. This fix will be included in the future 4.4.1 I suppose