diff --git a/UI/Web/src/app/_services/account.service.ts b/UI/Web/src/app/_services/account.service.ts
index 1894e8efd..ce43a0b3f 100644
--- a/UI/Web/src/app/_services/account.service.ts
+++ b/UI/Web/src/app/_services/account.service.ts
@@ -79,7 +79,7 @@ export class AccountService implements OnDestroy {
 
       localStorage.setItem(this.userKey, JSON.stringify(user));
       localStorage.setItem(this.lastLoginKey, user.username);
-      if (user.preferences) {
+      if (user.preferences && user.preferences.theme) {
         this.themeService.setTheme(user.preferences.theme.name);
       } else {
         this.themeService.setTheme(this.themeService.defaultTheme);