diff --git a/src/client/app/mios.ts b/src/client/app/mios.ts
index 0f72cd2f3..ed9e3a6ae 100644
--- a/src/client/app/mios.ts
+++ b/src/client/app/mios.ts
@@ -265,7 +265,7 @@ export default class MiOS extends EventEmitter {
 			// When success
 			.then(res => {
 				// When failed to authenticate user
-				if (res.status !== 200) {
+				if (res.status !== 200 && res.status < 500) {
 					return this.signout();
 				}