diff --git a/electrum/submarine_swaps.py b/electrum/submarine_swaps.py
index c65f74734..aa5399c50 100644
--- a/electrum/submarine_swaps.py
+++ b/electrum/submarine_swaps.py
@@ -1725,7 +1725,7 @@ class NostrTransport(SwapServerTransport):
                         "error": str(e)[:100],
                         "reply_to": event.id,
                     })
-                    await self.send_direct_message(event.pubkey,[], error_response)
+                    await self.send_direct_message(event.pubkey, error_response)
             else:
                 self.logger.info(f'unknown message {content}')