diff --git a/storage/mongodb.go b/storage/mongodb.go
index 50bb9d8..5762d91 100755
--- a/storage/mongodb.go
+++ b/storage/mongodb.go
@@ -72,15 +72,15 @@ func (s MongoDBStorage) LocalAuthentication(namespace string, username *string,
 	account := &Account{}
 
 	if username != nil {
-		if err := collection.FindOne(context.TODO(), bson.M{"namespace": namespace, "authentication.local.username": username}).Decode(account); err != nil {
+		if err := collection.FindOne(context.TODO(), bson.M{"namespace": namespace, "authentication.local.username": *username}).Decode(account); err != nil {
 			return nil, err
 		}
 	} else if email != nil {
-		if err := collection.FindOne(context.TODO(), bson.M{"namespace": namespace, "authentication.local.email": email}).Decode(account); err != nil {
+		if err := collection.FindOne(context.TODO(), bson.M{"namespace": namespace, "authentication.local.email": *email}).Decode(account); err != nil {
 			return nil, err
 		}
 	} else if phone_number != nil {
-		if err := collection.FindOne(context.TODO(), bson.M{"namespace": namespace, "authentication.local.phone_number": phone_number}).Decode(account); err != nil {
+		if err := collection.FindOne(context.TODO(), bson.M{"namespace": namespace, "authentication.local.phone_number": *phone_number}).Decode(account); err != nil {
 			return nil, err
 		}
 	} else {