diff --git a/async_substrate_interface/sync_substrate.py b/async_substrate_interface/sync_substrate.py
index c2c9b3c..1ede60a 100644
--- a/async_substrate_interface/sync_substrate.py
+++ b/async_substrate_interface/sync_substrate.py
@@ -1626,7 +1626,7 @@ def _make_rpc_request(
                 if item_id not in request_manager.responses or isinstance(
                     result_handler, Callable
                 ):
-                    if response := _received.pop(item_id):
+                    if response := _received.pop(item_id, None):
                         if (
                             isinstance(result_handler, Callable)
                             and not subscription_added