handle_error_from_failed_htlc: blacklist channel if cannot decode payload

electrum/lnworker.py

@@ -1055,7 +1055,8 @@ class LNWallet(LNWorker):
             payload = self._decode_channel_update_msg(channel_update_as_received)
             if payload is None:
                 self.logger.info(f'could not decode channel_update for failed htlc: {channel_update_as_received.hex()}')
-                return True
+                blacklist = True
+            else:
                 r = self.channel_db.add_channel_update(payload)
                 blacklist = False
                 short_channel_id = ShortChannelID(payload['short_channel_id'])