diff --git a/src/widgets/kernel/qgesturemanager.cpp b/src/widgets/kernel/qgesturemanager.cpp
index 76ae157137c..86e0c49370d 100644
--- a/src/widgets/kernel/qgesturemanager.cpp
+++ b/src/widgets/kernel/qgesturemanager.cpp
@@ -110,8 +110,10 @@ void QGestureManager::unregisterGestureRecognizer(Qt::GestureType type)
         ObjectGesture objectGesture = iter.key();
         if (objectGesture.gesture == type) {
             foreach (QGesture *g, iter.value()) {
-                if (QGestureRecognizer *recognizer = m_gestureToRecognizer.value(g)) {
-                    m_gestureToRecognizer.remove(g);
+                auto it = m_gestureToRecognizer.constFind(g);
+                if (it != m_gestureToRecognizer.cend() && it.value()) {
+                    QGestureRecognizer *recognizer = it.value();
+                    m_gestureToRecognizer.erase(it);
                     m_obsoleteGestures[recognizer].insert(g);
                 }
             }