From 26dd533662c6a40fe1f04108379c02973833c20e Mon Sep 17 00:00:00 2001
From: Jeremy Marc <jeremy.marc@me.com>
Date: Sun, 4 Nov 2012 19:04:13 -0800
Subject: [PATCH] Compare to null instead of using isset

---
 lib/Doctrine/ORM/AbstractQuery.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Doctrine/ORM/AbstractQuery.php b/lib/Doctrine/ORM/AbstractQuery.php
index ecc7dbca1..0913b73f4 100644
--- a/lib/Doctrine/ORM/AbstractQuery.php
+++ b/lib/Doctrine/ORM/AbstractQuery.php
@@ -281,7 +281,7 @@ abstract class AbstractQuery
 
         $value = $values[$class->getSingleIdentifierFieldName()];
 
-        if ( ! isset($value)) {
+        if (null === $value) {
             throw new \InvalidArgumentException(
                 "Binding entities to query parameters only allowed for entities that have an identifier."
             );