diff --git a/src/models/Track.js b/src/models/Track.js
index dfb24e7..cadd197 100644
--- a/src/models/Track.js
+++ b/src/models/Track.js
@@ -54,7 +54,7 @@ class Track extends mongoose.Model {
   }
 
   isVisibleToPrivate(user) {
-    return user._id.equals(this.author._id);
+    return user && user._id.equals(this.author._id);
   }
 
   /**