edit

src/Database.php

@@ -1631,7 +1631,7 @@ class Database
 
         if ($linkage) {
             foreach ($linkage as $k => $v) {
-                if ($v) {
+                if ($v && $v != -1) {
                     unset($search[$k]);
                     $k = str_replace('search_linkage_', '', $k);
                     if (isset($config['struct'][$k]['search_col'])) {