diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index 2fc3d768981..a37ae3b7a6c 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -5384,7 +5384,9 @@ QObjectPrivate::getPropertyAdaptorSlotObject(const QMetaProperty &property)
         Q_Q(QObject);
         const QMetaObject *metaObject = q->metaObject();
         int signal_index = methodIndexToSignalIndex(&metaObject, property.notifySignalIndex());
-        auto connectionList = conns->connectionsForSignal(signal_index);
+        if (signal_index >= conns->signalVectorCount())
+            return nullptr;
+        const auto connectionList = conns->connectionsForSignal(signal_index);
         for (auto c = connectionList.first.loadRelaxed(); c;
              c = c->nextConnectionList.loadRelaxed()) {
             if (c->isSlotObject) {
diff --git a/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp b/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
index 5ac7b5fb518..acbeea47301 100644
--- a/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
+++ b/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
@@ -1711,6 +1711,14 @@ class PropertyAdaptorTester : public QObject
     Q_PROPERTY(int foo1 READ foo WRITE setFoo)
 
 signals:
+    void dummySignal1();
+    void dummySignal2();
+    void dummySignal3();
+    void dummySignal4();
+    void dummySignal5();
+    void dummySignal6();
+    void dummySignal7();
+    void dummySignal8();
     void fooChanged(int newFoo);
 
 public slots:
@@ -1739,9 +1747,11 @@ void tst_QProperty::propertyAdaptorBinding()
 
     // Check binding of non BINDABLE property
     PropertyAdaptorTester object;
+    // set up a dummy connection (needed to verify that the QBindable avoids an out-of-bounds read)
+    QObject::connect(&object, &PropertyAdaptorTester::dummySignal1, [](){});
+    QBindable<int> binding(&object, "foo");
     QObject::connect(&object, &PropertyAdaptorTester::fooChanged, &object,
                      &PropertyAdaptorTester::fooHasChanged);
-    QBindable<int> binding(&object, "foo");
     binding.setBinding([&]() { return source + 1; });
     QCOMPARE(object.foo(), 6);
     QCOMPARE(object.fooChangedCount, 1);