From fa40f1e789e6ab8053c8a2e8029fb57b6b24aac8 Mon Sep 17 00:00:00 2001
From: MURAOKA Taro <koron.kaoriya@gmail.com>
Date: Fri, 7 Dec 2018 13:22:41 +0900
Subject: [PATCH] check driver.Valuer response

---
 statement.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/statement.go b/statement.go
index a7f7010a..a4881dbc 100644
--- a/statement.go
+++ b/statement.go
@@ -384,6 +384,9 @@ func (statement *Statement) buildUpdates(bean interface{},
 				val = engine.formatColTime(col, t)
 			} else if nulType, ok := fieldValue.Interface().(driver.Valuer); ok {
 				val, _ = nulType.Value()
+				if val == nil && !requiredField {
+					continue
+				}
 			} else {
 				if !col.SQLType.IsJson() {
 					engine.autoMapType(fieldValue)