diff --git a/electrum/lnchannel.py b/electrum/lnchannel.py
index bf9b80717..3dd96ff43 100644
--- a/electrum/lnchannel.py
+++ b/electrum/lnchannel.py
@@ -801,7 +801,7 @@ class Channel(AbstractChannel):
         self._outgoing_channel_update = None  # type: Optional[bytes]
         self.revocation_store = RevocationStore(state["revocation_store"])
         self._can_send_ctx_updates = True  # type: bool
-        self._receive_fail_reasons = {}  # type: Dict[int, (bytes, OnionRoutingFailure)]
+        self._receive_fail_reasons = {}  # type: Dict[int, tuple[bytes | None, OnionRoutingFailure | None]]
         self.unconfirmed_closing_txid = None # not a state, only for GUI
         self.sent_channel_ready = False # no need to persist this, because channel_ready is re-sent in channel_reestablish
         self.sent_announcement_signatures = False