diff --git a/dbpool.go b/dbpool.go
index 66a2d17..82b6e1a 100644
--- a/dbpool.go
+++ b/dbpool.go
@@ -206,7 +206,9 @@ func (this *dbPool) Upsert(
 				return
 			}
 			if ds.Next() {
-				this.Update(dataSource, tblName, whereKv, updateKv, cb)
+				if len(updateKv) > 0 {
+					this.Update(dataSource, tblName, whereKv, updateKv, cb)
+				}
 			} else {
 				this.Insert(dataSource, tblName, insertKv, cb)
 			}