diff --git a/xrd.py b/xrd.py
index af7e9b6..8a8dcfe 100644
--- a/xrd.py
+++ b/xrd.py
@@ -325,7 +325,10 @@ def run_server():
                     conn.sendall(f"M{tef.modulation}\n".encode())
 
                 while True:
-                    readable, _, _ = select.select([conn], [], [], 0.03)
+                    try:
+                        if conn.fileno() == -1: break
+                        readable, _, _ = select.select([conn], [], [], 0.03)
+                    except (ValueError, OSError): break
                     if readable:
                         data = conn.recv(256)
                         if not data: break