Index: Slim/Web/Pages.pm
===================================================================
--- Slim/Web/Pages.pm	(revision 1765)
+++ Slim/Web/Pages.pm	(working copy)
@@ -1186,7 +1186,9 @@
 
 	} else {
 
-		$params->{'playlist_items'} = join('', @{$listBuild->{'playlist_items'}});
+		if (defined $listBuild->{'playlist_items'}) {
+			$params->{'playlist_items'} = join('', @{$listBuild->{'playlist_items'}});
+		}
 
 		undef %$listBuild;