Fix an update_string() bug
diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
index a358558..cc43d83 100644
--- a/system/database/DB_query_builder.php
+++ b/system/database/DB_query_builder.php
@@ -1575,7 +1575,7 @@
 		}
 
 		$sql = $this->_update($this->protect_identifiers($this->qb_from[0], TRUE, NULL, FALSE), $this->qb_set);
-
+var_dump($sql);
 		$this->_reset_write();
 		return $this->query($sql);
 	}