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-rw-r--r--src/fltk-widgets-groups-windows-single.adb5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/fltk-widgets-groups-windows-single.adb b/src/fltk-widgets-groups-windows-single.adb
index ea7590c..bc89b10 100644
--- a/src/fltk-widgets-groups-windows-single.adb
+++ b/src/fltk-widgets-groups-windows-single.adb
@@ -72,11 +72,12 @@ package body FLTK.Widgets.Groups.Windows.Single is
procedure Finalize
(This : in out Single_Window) is
begin
- if This in Single_Window and then
- This.Void_Ptr /= System.Null_Address
+ if This.Void_Ptr /= System.Null_Address and then
+ This in Single_Window'Class
then
This.Clear;
free_fl_single_window (This.Void_Ptr);
+ This.Void_Ptr := System.Null_Address;
end if;
Finalize (Window (This));
end Finalize;