diff --git a/core/playback/queue.go b/core/playback/queue.go
index a452b499d..0c230a61f 100644
--- a/core/playback/queue.go
+++ b/core/playback/queue.go
@@ -104,7 +104,7 @@ func (pd *Queue) Shuffle() {
 	var err error
 	pd.Index, err = pd.getMediaFileIndexByID(backupID)
 	if err != nil {
-		log.Error("Could not find ID while shuffling: " + backupID)
+		log.Error("Could not find ID while shuffling: %s", backupID)
 	}
 }