diff --git a/src/testlib/qtestcase.cpp b/src/testlib/qtestcase.cpp
index f01c588e6de..c3512f9d873 100644
--- a/src/testlib/qtestcase.cpp
+++ b/src/testlib/qtestcase.cpp
@@ -2139,6 +2139,7 @@ void QTest::addColumnInternal(int id, const char *name)
 */
 QTestData &QTest::newRow(const char *dataTag)
 {
+    QTEST_ASSERT_X(dataTag, "QTest::newRow()", "Data tag can not be null");
     QTestTable *tbl = QTestTable::currentTestTable();
     QTEST_ASSERT_X(tbl, "QTest::addColumn()", "Cannot add testdata outside of a _data slot.");