diff --git a/reactos/subsystems/win32/win32k/ntuser/window.c b/reactos/subsystems/win32/win32k/ntuser/window.c
index ddfb0404b0e..af6cbb1c83b 100644
--- a/reactos/subsystems/win32/win32k/ntuser/window.c
+++ b/reactos/subsystems/win32/win32k/ntuser/window.c
@@ -319,6 +319,8 @@ UserFreeWindowInfo(PW32THREADINFO ti, PWINDOW_OBJECT WindowObject)
     PCLIENTINFO ClientInfo = GetWin32ClientInfo();
     PWND Wnd = WindowObject->Wnd;
 
+    if (!Wnd) return;
+    
     if (ClientInfo->CallbackWnd.pvWnd == DesktopHeapAddressToUser(WindowObject->Wnd))
     {
         ClientInfo->CallbackWnd.hWnd = NULL;