diff --git a/lib/base/dao/dao.class.php b/lib/base/dao/dao.class.php
index f7b0039625..b268db12e1 100644
--- a/lib/base/dao/dao.class.php
+++ b/lib/base/dao/dao.class.php
@@ -1654,6 +1654,8 @@ class baseSQL
      */
     public function set($set)
     {
+        if($this->inCondition and !$this->conditionIsTrue) return $this;
+
         /* Add ` to avoid keywords of mysql. */
         if(strpos($set, '=') ===false)
         {