diff --git a/nulltime.go b/nulltime.go
index 167a182..ab0bcea 100644
--- a/nulltime.go
+++ b/nulltime.go
@@ -106,8 +106,8 @@ func (n *Time) UnmarshalJSON(b []byte) error {
 	return nil
 }
 
-func (n Time) MarshalText() ([]byte, error) {
-	if n.Valid {
+func (n *Time) MarshalText() ([]byte, error) {
+	if n != nil && n.Valid {
 		location, err := time.LoadLocation(n.Timezone)
 		if err != nil {
 			location = time.UTC
@@ -117,8 +117,8 @@ func (n Time) MarshalText() ([]byte, error) {
 	return json.Marshal(nil)
 }
 
-func (n Time) MarshalJSON() ([]byte, error) {
-	if n.Valid {
+func (n *Time) MarshalJSON() ([]byte, error) {
+	if n != nil && n.Valid {
 		location, err := time.LoadLocation(n.Timezone)
 		if err != nil {
 			location = time.UTC