diff --git a/src/routes/api/v1/user.ts b/src/routes/api/v1/user.ts
index 14c2a0f..bda9001 100644
--- a/src/routes/api/v1/user.ts
+++ b/src/routes/api/v1/user.ts
@@ -95,7 +95,7 @@ async function post(req: Request, res: Response) {
 			.create({
 				data: {
 					name: value.name,
-					code: value.code
+					code: (value.code === '0000') ? null : value.code
 				},
 				select: {
 					id: true