--- web/modules/contrib/ldap/ldap_query/src/Controller/QueryController.php	(date 1645005955896)
+++ web/modules/contrib/ldap/ldap_query/src/Controller/QueryController.php	(date 1645005955896)
@@ -146,7 +146,12 @@
             $base_dn_results[] = $ldap_response;
           }
         }
-        $this->results = array_merge(...$base_dn_results);
+        if (!empty($base_dn_results) && is_array($base_dn_results)) {
+          $this->results = array_merge(...$base_dn_results);
+        }
+        else {
+          $this->results = $base_dn_results;
+        }
       }
     }
     else {