diff --git a/lcl/interfaces/qt/qtint.pp b/lcl/interfaces/qt/qtint.pp
index 4c08f2525c..369491d3a8 100644
--- a/lcl/interfaces/qt/qtint.pp
+++ b/lcl/interfaces/qt/qtint.pp
@@ -388,7 +388,7 @@ begin
       {$IFDEF CPU64}
       Obj := TObject(QVariant_toULongLong(V, @Ok));
       {$ENDIF}
-      if OK and (Obj <> nil) then
+      if OK and QtWidgetset.IsValidHandle(HWND(Obj)) then
       begin
         if not (Obj is TQtWidget) then
           raise Exception.Create('QtObjectFromWidgetH: QObject_property returned '