diff --git a/ChangeLog b/ChangeLog
index 72b23ca7..4cf5c8eb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -24174,3 +24174,6 @@
 2023-05-25 Fred Gleason <fredg@paravelsystems.com>
 	* Fixed a bug in the podcasting subsystem that could cause SFTP
 	operations to fail due to unknown SSH host certificates.
+2023-05-25 Fred Gleason <fredg@paravelsystems.com>
+	* Fixed a bug in rdvairplayd(8) that caused spurious 'sent
+	unrecognized command "TS -1"' messages to be sent to the syslog.
diff --git a/lib/rdlogplay.cpp b/lib/rdlogplay.cpp
index 48941541..fede40a8 100644
--- a/lib/rdlogplay.cpp
+++ b/lib/rdlogplay.cpp
@@ -2,7 +2,7 @@
 //
 // Rivendell Log Playout Machine
 //
-//   (C) Copyright 2002-2022 Fred Gleason <fredg@paravelsystems.com>
+//   (C) Copyright 2002-2023 Fred Gleason <fredg@paravelsystems.com>
 //
 //   This program is free software; you can redistribute it and/or modify
 //   it under the terms of the GNU General Public License version 2 as
@@ -242,7 +242,9 @@ void RDLogPlay::setChannels(int cards[2],int ports[2],QString labels[2],
     play_label[i]=labels[i];
     play_start_rml[i]=start_rml[i];
     play_stop_rml[i]=stop_rml[i];
-    play_cae->requestTimescale(play_card[i]);
+    if(play_card[i]>=0) {
+      play_cae->requestTimescale(play_card[i]);
+    }
   }
 }