diff --git a/src/Pachyderm/Orm/QueryBuilder.php b/src/Pachyderm/Orm/QueryBuilder.php
index 9afb0b4..9b1d06c 100644
--- a/src/Pachyderm/Orm/QueryBuilder.php
+++ b/src/Pachyderm/Orm/QueryBuilder.php
@@ -43,7 +43,9 @@ private function addWhere($globalOperator, $field, $operator, $value)
         }
 
         if ($field instanceof QueryBuilder) {
-            $this->append($globalOperator, $field->build());
+            $filters = $field->build();
+            if (empty($filters)) return $this;
+            $this->append($globalOperator, $filters);
             return $this;
         }