Ticket #14880: 14880.diff

wp-includes/query.php

@@ -1927 +1927 @@
                 if ( !empty( $tax_query ) ) {
                         $this->tax_query = $tax_query;
 
-                        $where .= " AND $wpdb->posts.ID IN( " . implode( ', ', wp_tax_query( $tax_query ) ) . ")";
+                        $tax_found_posts = wp_tax_query( $tax_query );
+
+                        if ( empty( $tax_found_posts ) )
+                                $where .= " AND 0 = 1";
+                        else
+                                $where .= " AND $wpdb->posts.ID IN( " . implode( ', ', $tax_found_posts ) . ")";
                 }
 
                 if ( !empty($q['meta_key']) ) {