diff --git a/backend/open_webui/utils/oauth.py b/backend/open_webui/utils/oauth.py
index 249cc62d7..4b6568bee 100644
--- a/backend/open_webui/utils/oauth.py
+++ b/backend/open_webui/utils/oauth.py
@@ -1706,7 +1706,7 @@ class OAuthManager:
         redirect_url = f"{redirect_base_url}/auth"
 
         if error_message:
-            redirect_url = f"{redirect_url}?error={error_message}"
+            redirect_url = f"{redirect_url}?error={urllib.parse.quote_plus(error_message)}"
             return RedirectResponse(url=redirect_url, headers=response.headers)
 
         response = RedirectResponse(url=redirect_url, headers=response.headers)