diff --git a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
index 0a6ab8657..a0a71922a 100644
--- a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
+++ b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
@@ -243,7 +243,7 @@ abstract class AbstractHydrator
             }
 
             if (isset($cache[$key]['isMetaColumn'])) {
-                if ( ! isset($rowData[$dqlAlias][$cache[$key]['fieldName']]) || $value !== null) {
+                if ( ! isset($rowData[$dqlAlias][$cache[$key]['fieldName']]) && $value !== null) {
                     $rowData[$dqlAlias][$cache[$key]['fieldName']] = $value;
                     if ($cache[$key]['isIdentifier']) {
                         $nonemptyComponents[$dqlAlias] = true;
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1548Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1548Test.php
new file mode 100644
index 000000000..0baeca2f7
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1548Test.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+/**
+ * @group DDC-1548
+ */
+class DDC1548Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+        $this->_schemaTool->createSchema(array(
+            $this->_em->getClassMetadata(__NAMESPACE__ . '\\DDC1548E1'),
+            $this->_em->getClassMetadata(__NAMESPACE__ . '\\DDC1548E2'),
+            $this->_em->getClassMetadata(__NAMESPACE__ . '\\DDC1548Rel'),
+        ));
+    }
+
+    public function testIssue()
+    {
+        $rel = new DDC1548Rel();
+        $this->_em->persist($rel);
+        $this->_em->flush();
+
+        $e1 = new DDC1548E1();
+        $e1->rel = $rel;
+        $this->_em->persist($e1);
+        $this->_em->flush();
+        $this->_em->clear();
+
+        $obt = $this->_em->find(__NAMESPACE__ . '\DDC1548Rel', $rel->id);
+        
+        $this->assertNull($obt->e2);
+    }
+}
+
+/**
+ * @Entity
+ */
+class DDC1548E1
+{
+    /**
+     * @Id
+     * @OneToOne(targetEntity="DDC1548Rel", inversedBy="e1")
+     */
+    public $rel;
+}
+/**
+ * @Entity
+ */
+class DDC1548E2
+{
+    /**
+     * @Id
+     * @OneToOne(targetEntity="DDC1548Rel", inversedBy="e2")
+     */
+    public $rel;
+}
+
+/**
+ * @Entity
+ */
+class DDC1548Rel
+{
+    /**
+     * @Id @GeneratedValue
+     * @Column(type="integer")
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity="DDC1548E1", mappedBy="rel")
+     */
+    public $e1;
+    /**
+     * @OneToOne(targetEntity="DDC1548E2", mappedBy="rel")
+     */
+    public $e2;
+}
\ No newline at end of file