diff --git a/win32ss/user/ntuser/clipboard.c b/win32ss/user/ntuser/clipboard.c
index d144220a18..8cbe00dd7f 100644
--- a/win32ss/user/ntuser/clipboard.c
+++ b/win32ss/user/ntuser/clipboard.c
@@ -379,6 +379,9 @@ UserClipboardRelease(PWND pWindow)
     if (!pWinStaObj)
         return;
 
+    if (!pWindow) 
+        return;
+
     co_IntSendMessage(pWinStaObj->spwndClipOwner->head.h, WM_RENDERALLFORMATS, 0, 0);
 
     /* If the window being destroyed is the current clipboard owner... */