1 files changed, 2 insertions, 0 deletions
diff --git a/src/fltk-environment.adb b/src/fltk-environment.adb
index 4cafb19..1632717 100644
--- a/src/fltk-environment.adb
+++ b/src/fltk-environment.adb
@@ -400,6 +400,7 @@ package body FLTK.Environment is
     begin
         if This.Void_Ptr /= Null_Pointer and This.Needs_Dealloc then
             free_fl_pref_database (This.Void_Ptr);
+            This.Void_Ptr := Null_Pointer;
         end if;
     end Finalize;
 
@@ -409,6 +410,7 @@ package body FLTK.Environment is
     begin
         if This.Void_Ptr /= Null_Pointer and This.Needs_Dealloc then
             free_fl_pref_group (This.Void_Ptr);
+            This.Void_Ptr := Null_Pointer;
             if This.Root_Ptr /= Null_Pointer then
                 free_fl_pref_database (This.Root_Ptr);
             end if;