Index: Slim/Plugin/PreventStandby/Plugin.pm
===================================================================
--- Slim/Plugin/PreventStandby/Plugin.pm	(revision 24314)
+++ Slim/Plugin/PreventStandby/Plugin.pm	(working copy)
@@ -53,7 +53,7 @@
 
 	for my $client (Slim::Player::Client::clients()) {
 
-		if ($client->isPlaying()) {
+		if (Slim::Buttons::Common::mode ($client) !~ /^[off]/i) {
 
 			$log->info("Setting thread execution state");