Ticket #20590: query-is-tax-fix.diff

wp-includes/query.php

@@ -3185 +3185 @@
                 $tax_array = array_intersect( array_keys( $wp_taxonomies ), (array) $taxonomy );
                 $term_array = (array) $term;
 
+                $is_tax = isset( $queried_object->taxonomy ) && count( $tax_array ) && in_array( $queried_object->taxonomy, $tax_array );
+                
                 if ( empty( $term ) ) // Only a Taxonomy provided
-                        return isset( $queried_object->taxonomy ) && count( $tax_array ) && in_array( $queried_object->taxonomy, $tax_array );
+                        return $is_tax;
 
-                return isset( $queried_object->term_id ) &&
+                return $is_tax && isset( $queried_object->term_id ) &&
                         count( array_intersect(
                                 array( $queried_object->term_id, $queried_object->name, $queried_object->slug ),
                                 $term_array