Index: Slim/Player/SqueezeSlave.pm
===================================================================
--- Slim/Player/SqueezeSlave.pm	(revision 25815)
+++ Slim/Player/SqueezeSlave.pm	(revision 25816)
@@ -133,7 +133,7 @@
 	my $newvolume = shift;
 
 	my $volume = $client->Slim::Player::Client::volume($newvolume, @_);
-	my $preamp = 255 - int(2 * $prefs->client($client)->get('preampVolumeControl'));
+	my $preamp = 255 - int(2 * ($prefs->client($client)->get('preampVolumeControl') || 0));
 
 	if (defined($newvolume)) {
 		# Old style volume: