diff --git a/dlls/hhctrl.ocx/help.c b/dlls/hhctrl.ocx/help.c
index e98eb82..abbc0c5 100644
--- a/dlls/hhctrl.ocx/help.c
+++ b/dlls/hhctrl.ocx/help.c
@@ -631,7 +631,8 @@
         ReleaseHelpViewer((HHInfo *)GetWindowLongPtrW(hWnd, GWLP_USERDATA));
         return 0;
     case WM_DESTROY:
-        PostQuitMessage(0);
+        if(hh_process)
+            PostQuitMessage(0);
         break;
 
     default: