diff --git a/src/client.rs b/src/client.rs
index 4b8cb68..a67cf0b 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -183,8 +183,10 @@ pub async fn connection_handler(
                 if packet.kind() == PacketKind::End {
                     packet.header.kind = PacketKind::Reject.raw();
                     packet.data.clear();
-                    packet.data.extend_from_slice(b"nc\0");
-                    packet.header.length = packet.data.len() as u8;
+                    if packet.data.is_empty() {
+                        packet.data.extend_from_slice(b"nc\0");
+                        packet.header.length = packet.data.len() as u8;
+                    }
                 }
 
                 port_handler.lock().await.start_rejector(