diff --git a/backend/config.py b/backend/config.py
index 41f1149..8be2e04 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -45,7 +45,7 @@ proxy_server = os.environ.get("PROXY_SERVER")
 @dataclasses.dataclass
 class LinkWithType:
     upstream: str
-    ctype: str
+    ctype: None | str = None
 
 
 class ProxyCreateLink(pydantic.BaseModel):
diff --git a/backend/stream.py b/backend/stream.py
index 0197c3b..a73039b 100755
--- a/backend/stream.py
+++ b/backend/stream.py
@@ -138,7 +138,9 @@ class MainHandler(tornado.web.RequestHandler):
                         upstream=provider_data.upstream(),
                         ctype=provider_data.proxy_ctype(),
                     ),
-                    provider_data.thumbnail(),
+                    config.LinkWithType(
+                        upstream=provider_data.thumbnail(),
+                    ),
                 ]
             )
             video_info["upstream"] = proxied[0]