diff --git a/src/corelib/tools/qcollator.cpp b/src/corelib/tools/qcollator.cpp
index f1e3d6652d..2d17b00ba2 100644
--- a/src/corelib/tools/qcollator.cpp
+++ b/src/corelib/tools/qcollator.cpp
@@ -89,7 +89,8 @@ QCollator::QCollator(const QLocale &locale)
 QCollator::QCollator(const QCollator &other)
     : d(other.d)
 {
-    d->ref.ref();
+    if (d)
+        d->ref.ref();
 }
 
 /*!
diff --git a/tests/auto/corelib/tools/qcollator/tst_qcollator.cpp b/tests/auto/corelib/tools/qcollator/tst_qcollator.cpp
index 480e723f44..00b22dab6c 100644
--- a/tests/auto/corelib/tools/qcollator/tst_qcollator.cpp
+++ b/tests/auto/corelib/tools/qcollator/tst_qcollator.cpp
@@ -72,6 +72,9 @@ void tst_QCollator::moveSemantics()
     QCOMPARE(c2.locale(), de_AT);
     QVERIFY(dpointer_is_null(c1));
 
+    QCollator c3(c1);
+    QVERIFY(dpointer_is_null(c3));
+
     c1 = std::move(c2);
     QCOMPARE(c1.locale(), de_AT);
     QVERIFY(dpointer_is_null(c2));