fix a crash in QQuickEventPoint::setGrabberPointerHandler

If a Pointer Handler is used in an item view delegate, it can hold a
passive grab at the time it is destroyed, in which case the QPointer
will be set to null.

Change-Id: I18d9da36b95a22de327913b3a296bdbea1d7bb1a
Reviewed-by: David Edmundson <davidedmundson@kde.org>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/quick/items/qquickevents.cpp b/src/quick/items/qquickevents.cpp
index d020ad7c4c..cac52858b1 100644
--- a/src/quick/items/qquickevents.cpp
+++ b/src/quick/items/qquickevents.cpp
@@ -901,7 +901,7 @@ void QQuickEventPoint::setGrabberPointerHandler(QQuickPointerHandler *grabber, b
             if (grabber) {
                 grabber->onGrabChanged(grabber, GrabExclusive, this);
                 for (QPointer<QQuickPointerHandler> passiveGrabber : m_passiveGrabbers) {
-                    if (passiveGrabber != grabber)
+                    if (!passiveGrabber.isNull() && passiveGrabber != grabber)
                         passiveGrabber->onGrabChanged(grabber, OverrideGrabPassive, this);
                 }
             }