# UNDF: UNDF-2026-000000951
--- a/src/tiled/editpolygontool.cpp
+++ b/src/tiled/editpolygontool.cpp
@@ -383,6 +383,8 @@ void EditPolygonTool::updateHandles()
 {
     const QList<MapObject*> &selection = mapDocument()->selectedObjects();

+    const QSet<MapObject*> selectionSet(selection.begin(), selection.end());
+
     auto deleteHandle = [this](PointHandle *handle) {
         if (mHoveredHandle == handle)
             mHoveredHandle = nullptr;
@@ -399,13 +401,13 @@ void EditPolygonTool::updateHandles()
     QMutableHashIterator<MapObject*, QList<PointHandle*> > i(mHandles);
     while (i.hasNext()) {
         i.next();
-        if (!selection.contains(i.key())) {
+        if (!selectionSet.contains(i.key())) {
             for (PointHandle *handle : std::as_const(i.value()))
                 deleteHandle(handle);

             i.remove();
         }
     }
-    if (mHoveredSegment && !selection.contains(mHoveredSegment.object))
+    if (mHoveredSegment && !selectionSet.contains(mHoveredSegment.object))
         mHoveredSegment.clear();
-    if (mClickedSegment && !selection.contains(mClickedSegment.object))
+    if (mClickedSegment && !selectionSet.contains(mClickedSegment.object))
         mClickedSegment.clear();