diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index 53e320e717b..51cb7f4856e 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -2390,7 +2390,7 @@ QMetaMethod::MethodType QMetaMethod::methodType() const
     \since 5.0
 
     Returns the meta-method that corresponds to the given \a signal, or an
-    invalid QMetaMethod if \a signal is not a signal of the class.
+    invalid QMetaMethod if \a signal is \c{nullptr} or not a signal of the class.
 
     Example:
 
diff --git a/tests/auto/corelib/kernel/qmetamethod/tst_qmetamethod.cpp b/tests/auto/corelib/kernel/qmetamethod/tst_qmetamethod.cpp
index ad2f2564506..47012f9a28d 100644
--- a/tests/auto/corelib/kernel/qmetamethod/tst_qmetamethod.cpp
+++ b/tests/auto/corelib/kernel/qmetamethod/tst_qmetamethod.cpp
@@ -22,6 +22,7 @@ private slots:
     void comparisonOperators();
 
     void fromSignal();
+    void fromSignalOfNullSignalIsInvalid();
 
     void gadget();
     void revision();
@@ -719,6 +720,12 @@ void tst_QMetaMethod::fromSignal()
 #undef FROMSIGNAL_HELPER
 }
 
+void tst_QMetaMethod::fromSignalOfNullSignalIsInvalid()
+{
+    constexpr decltype(&QObject::destroyed) ptr = nullptr;
+    QVERIFY(!QMetaMethod::fromSignal(ptr).isValid());
+}
+
 class MyGadget {
     Q_GADGET
 public: