Ticket #26627: 26627.diff

src/wp-includes/query.php

@@ -3265 +3265 @@
                 if ( $this->is_category || $this->is_tag || $this->is_tax ) {
                         if ( $this->is_category ) {
                                 $term = get_term( $this->get( 'cat' ), 'category' );
+                                if ( null == $term || is_wp_error( $term ) ) {
+                                        $term = get_term_by( 'name', $this->get( 'category_name' ), 'category' );
+                                }
                         } elseif ( $this->is_tag ) {
                                 $term = get_term( $this->get( 'tag_id' ), 'post_tag' );
                         } else {