diff --git a/backend/open_webui/utils/oauth.py b/backend/open_webui/utils/oauth.py
index 208b892..25be2db 100644
--- a/backend/open_webui/utils/oauth.py
+++ b/backend/open_webui/utils/oauth.py
@@ -308,7 +308,7 @@ class OAuthManager:
                     Users.update_user_oauth_sub_by_id(user.id, provider_sub)
 
         if user:
-            generated_image = Users.generate_letter_image("A")
+            generated_image = Users.generate_letter_image('A')
             print(generated_image)
             
             Auths.update_user_profile(
@@ -322,8 +322,7 @@ class OAuthManager:
 
         if not user:
             
-            generated_image = Users.generate_letter_image("A")
-            
+            generated_image = Users.generate_letter_image('A')
             print(generated_image)
             
             user_count = Users.get_num_users()