diff --git a/types/datum.go b/types/datum.go
index c3eafbd9f3..610e01f92a 100644
--- a/types/datum.go
+++ b/types/datum.go
@@ -430,9 +430,11 @@ func (d *Datum) GetValue() interface{} {
 
 // SetValueWithDefaultCollation sets any kind of value.
 func (d *Datum) SetValueWithDefaultCollation(val interface{}) {
-	switch x := val.(type) {
-	case nil:
+	if val == nil {
 		d.SetNull()
+		return
+	}
+	switch x := val.(type) {
 	case bool:
 		if x {
 			d.SetInt64(1)
@@ -478,9 +480,11 @@ func (d *Datum) SetValueWithDefaultCollation(val interface{}) {
 
 // SetValue sets any kind of value.
 func (d *Datum) SetValue(val interface{}, tp *types.FieldType) {
-	switch x := val.(type) {
-	case nil:
+	if val == nil {
 		d.SetNull()
+		return
+	}
+	switch x := val.(type) {
 	case bool:
 		if x {
 			d.SetInt64(1)