diff --git a/TaskManager.cs b/TaskManager.cs
index 5ef3569..e482b46 100644
--- a/TaskManager.cs
+++ b/TaskManager.cs
@@ -31,7 +31,7 @@ public class TaskManager
 
     public bool PublicationAlreadyAdded(Publication publication)
     {
-        return false;
+        throw new NotImplementedException();
         //TODO fuzzy check publications
     }