diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index d39071f..730a6aa 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -106,7 +106,7 @@ class ApiClient {
 
       if (response.ok) {
         const data = await response.json();
-        this.setTokens(data.access_token, data.refresh_token);
+        this.setTokens(data.access_token, data.refresh_token || this.refreshToken!);
         return true;
       }