From 87b1115db1aeb39d09fa5cdf349b1c0d6fea7d9f Mon Sep 17 00:00:00 2001
From: "Erich E. Hoover" <erich.e.hoover@gmail.com>
Date: Wed, 6 Nov 2013 11:59:16 -0700
Subject: [PATCH] hhctrl.ocx: Do not destroy the HTML Help window when
 HH_HELP_CONTEXT finds no context id of 0.

---
 dlls/hhctrl.ocx/hhctrl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/hhctrl.ocx/hhctrl.c b/dlls/hhctrl.ocx/hhctrl.c
index 339271546a7..8b425693f23 100644
--- a/dlls/hhctrl.ocx/hhctrl.c
+++ b/dlls/hhctrl.ocx/hhctrl.c
@@ -273,6 +273,8 @@ HWND WINAPI HtmlHelpW(HWND caller, LPCWSTR filename, UINT command, DWORD_PTR dat
         url = FindContextAlias(info->pCHMInfo, data);
         if(!url)
         {
+            if(!data) /* there may legitimately be no context alias for id 0 */
+                return info->WinType.hwndHelp;
             ReleaseHelpViewer(info);
             return NULL;
         }