Fix a bug with orderby query parameters that are arrays

Author: gchtr

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Types
 
+## 2.5.5 - 2021-11-30
+
+- Fixed a bug with orderby query parameters that are arrays.
+
 ## 2.5.4 - 2020-08-19
 
 - Fixed error notice.

lib/Post_Type_Columns.php

@@ -162,6 +162,7 @@ public function sort_by_meta( \WP_Query $query ) {
 		if ( ! $query->is_main_query()
 			|| $typenow !== $this->post_type
 			|| empty( $orderby )
+			|| ! is_string( $orderby )
 			|| ! isset( $this->columns[ $orderby ] )
 			|| 'meta' !== $this->columns[ $orderby ]['type']
 		) {