diff --git a/backend/stream.py b/backend/stream.py
index 803e514..d79dde6 100755
--- a/backend/stream.py
+++ b/backend/stream.py
@@ -98,9 +98,11 @@ class UpstreamHandler():
     def __init__(self):
         self.provider = None
         self.valid = False
-        self.proxy = None
+        self.proxy = ProxyElem(None)
         self.upstream = None
     async def test_socks(self, proxy):
+        if not isinstance(proxy, str):
+            return True
         try:
             splitted = proxy.rsplit(":", 1)
             host = proxy