diff --git a/components/virtualtreeview-new/branches/4.8/VirtualTrees.pas b/components/virtualtreeview-new/branches/4.8/VirtualTrees.pas
index 586d3e419..61bd83869 100644
--- a/components/virtualtreeview-new/branches/4.8/VirtualTrees.pas
+++ b/components/virtualtreeview-new/branches/4.8/VirtualTrees.pas
@@ -19825,7 +19825,7 @@ var
 
 begin
   //{$ifdef DEBUG_VTV}Logger.EnterMethod([lcDrag],'DragOver');{$endif}
-  if not VTVDragManager.DropTargetHelperSupported and (Source is TBaseVirtualTree) then
+  if Assigned(FDragManager) and not VTVDragManager.DropTargetHelperSupported and (Source is TBaseVirtualTree) then
   begin
     Tree := Source as TBaseVirtualTree;
     ScrollOptions := [suoUpdateNCArea];