diff --git a/src/controller/tokens/authorizationCode.ts b/src/controller/tokens/authorizationCode.ts
index 6f4bbd5..1b31d10 100644
--- a/src/controller/tokens/authorizationCode.ts
+++ b/src/controller/tokens/authorizationCode.ts
@@ -116,7 +116,7 @@ export async function authorizationCode(
     );
 
     try {
-      respObj.id_token = await oauth2.model.jwt.issueIdToken(user, cleanScope, null, code.nonce);
+      respObj.id_token = await oauth2.model.jwt.issueIdToken(user, cleanScope, undefined, code.nonce);
     } catch (err) {
       oauth2.logger.error(err);
       throw new ServerError('Failed to issue an ID token');