diff --git a/chain.go b/chain.go
index 456614e..187f0f4 100644
--- a/chain.go
+++ b/chain.go
@@ -225,6 +225,7 @@ func (this *Query) Clean() *Query {
 	this.upd_field = this.upd_field[0:0]
 	this.having = ""
 	this.alias = ""
+	this.close_hump = false
 	this.with = this.with[0:0]
 	return this
 }