diff --git a/programs/mutant-4/swen90006/passbook/PassBook.java b/programs/mutant-4/swen90006/passbook/PassBook.java
index 94e2dfdcd19284dafa914ed1214ff926ea3318da..dd1a65d7873b4c2e8d1bed94034899e8ced03a6d 100644
--- a/programs/mutant-4/swen90006/passbook/PassBook.java
+++ b/programs/mutant-4/swen90006/passbook/PassBook.java
@@ -250,7 +250,7 @@ public class PassBook
 	Pair<String, String> pair = pt.get(url);
 
 	//if this returned nothing, the user does not have a login for this url
-	if (pair == null) {
+	if (pt == null) {
 	    throw new NoSuchURLException(passbookUsername, url);
 	}