Alex Henrie : explorer: Only try to destroy the IShellWindows object if it exists.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: a85eedb43f9f93b2ecfe68e04399d872767c0203
URL:    https://gitlab.winehq.org/wine/wine/-/commit/a85eedb43f9f93b2ecfe68e04399d87...

Author: Alex Henrie 
Date:   Sun Jan 30 19:25:07 2022 -0700

explorer: Only try to destroy the IShellWindows object if it exists.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52494
Signed-off-by: Alex Henrie 
Signed-off-by: Alexandre Julliard 
(cherry picked from commit adda27cdb82fd40ef71e554b8ba17244cb871710)
Signed-off-by: Michael Stefaniuc

---

programs/explorer/explorer.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/programs/explorer/explorer.c b/programs/explorer/explorer.c
index cb0d63fb688..8fa732d6c1a 100644
--- a/programs/explorer/explorer.c
+++ b/programs/explorer/explorer.c
@@ -671,8 +671,11 @@ static LRESULT CALLBACK explorer_wnd_proc(HWND hwnd, UINT uMsg, WPARAM wParam, L
     switch(uMsg)
     {
     case WM_DESTROY:
-        IShellWindows_Revoke(info->sw, info->sw_cookie);
-        IShellWindows_Release(info->sw);
+        if(info->sw)
+        {
+            IShellWindows_Revoke(info->sw, info->sw_cookie);
+            IShellWindows_Release(info->sw);
+        }

IExplorerBrowser_Unadvise(browser,info->advise_cookie);
         IExplorerBrowser_Destroy(browser);