diff --git a/src/python/grpcio/grpc/experimental/aio/_channel.py b/src/python/grpcio/grpc/experimental/aio/_channel.py
index 536206241fe..7035dd6c35e 100644
--- a/src/python/grpcio/grpc/experimental/aio/_channel.py
+++ b/src/python/grpcio/grpc/experimental/aio/_channel.py
@@ -395,10 +395,9 @@ class Channel:
         # A new set is created acting as a shallow copy because
         # when cancellation happens the calls are automatically
         # removed from the originally set.
-        calls = WeakSet(self._ongoing_calls.calls)
+        calls = WeakSet(data=self._ongoing_calls.calls)
         for call in calls:
-            if call is not None:
-                call.cancel()
+            call.cancel()
 
         self._channel.close()