diff --git a/api/app/lib/controllers/organization/user.js b/api/app/lib/controllers/organization/user.js
index 14e0577..66c1c2b 100644
--- a/api/app/lib/controllers/organization/user.js
+++ b/api/app/lib/controllers/organization/user.js
@@ -172,7 +172,7 @@ async function getUser (ctx, next) {
         const models = ctx.fs.dc.models;
         const { depId } = ctx.params;
         let userRes = null;
-        if (depId !== 'null') {
+        if (depId !== 'undefined') {
             userRes = await models.User.findAll({
                 where: {
                     departmentId: parseInt(depId),