QmlDesigner: Fix crash

There is no guarantee that the timeline is valid at this point.

Change-Id: I48a31b1f4c305c4764d8bebee9de16e51aec4a47
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

1 files changed, 6 insertions, 4 deletions

diff --git a/src/plugins/qmldesigner/components/timelineeditor/timelinegraphicsscene.cpp b/src/plugins/qmldesigner/components/timelineeditor/timelinegraphicsscene.cpp
index 576717228d..6c25256249 100644
--- a/src/plugins/qmldesigner/components/timelineeditor/timelinegraphicsscene.cpp
+++ b/src/plugins/qmldesigner/components/timelineeditor/timelinegraphicsscene.cpp
@@ -174,11 +174,13 @@ void TimelineGraphicsScene::invalidateLayout()
 
 void TimelineGraphicsScene::updateKeyframePositionsCache()
 {
-    auto kfPos = keyframePositions();
-    std::sort(kfPos.begin(), kfPos.end());
-    kfPos.erase(std::unique(kfPos.begin(), kfPos.end()), kfPos.end()); // remove duplicates
+    if (currentTimeline().isValid()) {
+        auto kfPos = keyframePositions();
+        std::sort(kfPos.begin(), kfPos.end());
+        kfPos.erase(std::unique(kfPos.begin(), kfPos.end()), kfPos.end()); // remove duplicates
 
-    m_keyframePositionsCache = kfPos;
+        m_keyframePositionsCache = kfPos;
+    }
 }
 
 // snap a frame to nearest keyframe or ruler tick