diff --git a/Model/SqlCriteria.php b/Model/SqlCriteria.php
index c437d06..4c6a7a4 100644
--- a/Model/SqlCriteria.php
+++ b/Model/SqlCriteria.php
@@ -143,7 +143,7 @@ class SqlCriteria
         return $this;
     }
 
-    public function whereJoin($join_table_name, $cond, $value)
+    public function whereJoin($join_table_name, $cond, $value = null)
     {
         $join_table_placeholder = $this->getTablePh($join_table_name);
         if (is_array($cond)) {