fixed LuMultipleDbo map

src/Utils/LuMultipleDbo.php

@@ -48,7 +48,7 @@ class LuMultipleDbo implements \JsonSerializable {
     {
         $values = [];
         foreach ($this->_data as $data) {
-            $values = $callback($data);
+            $values[] = $callback($data);
         }
         return new LuMultipleDbo($this->_count, $values);
     }