Fix crash on GestureTap in Node::commonAncestor

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 757bdf11c82ae9d1d1eb1f115577fc3b10074a04..f5da1bb8b320e3931ebf63896b29cd55de25c1af 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -2265,8 +2265,10 @@ bool EventHandler::handleGestureTap(const GestureEventWithHitTestResults& target
 
     bool swallowClickEvent = false;
     if (m_clickNode) {
-        Node* clickTargetNode = newHitTest.targetNode()->commonAncestor(*m_clickNode, parentForClickEvent);
-        swallowClickEvent = !dispatchMouseEvent(EventTypeNames::click, clickTargetNode, gestureEvent.tapCount(), fakeMouseUp, true);
+        if (newHitTest.targetNode()) {
+            Node* clickTargetNode = newHitTest.targetNode()->commonAncestor(*m_clickNode, parentForClickEvent);
+            swallowClickEvent = !dispatchMouseEvent(EventTypeNames::click, clickTargetNode, gestureEvent.tapCount(), fakeMouseUp, true);
+        }
         m_clickNode = nullptr;
     }