Ticket #53978: 55131.diff

src/wp-admin/includes/class-wp-list-table.php

@@ -1079 +1079 @@
                 // If the primary column doesn't exist,
                 // fall back to the first non-checkbox column.
                 if ( ! isset( $columns[ $default ] ) ) {
-                        $default = self::get_default_primary_column_name();
+                        $list_table = new self();
+                        $default = $list_table->get_default_primary_column_name();
                 }
 
                 /**