diff --git a/mtprotoproxy.py b/mtprotoproxy.py
index e2c3b45..1ed3728 100755
--- a/mtprotoproxy.py
+++ b/mtprotoproxy.py
@@ -891,7 +891,7 @@ class ProxyReqStreamReader(LayeredStreamReaderBase):
             return b"", {"SKIP_SEND": True}
 
         print_err("unknown rpc ans type:", ans_type)
-        return b""
+        return b"", {"SKIP_SEND": True}
 
 
 class ProxyReqStreamWriter(LayeredStreamWriterBase):