From 951b26f892a16ff00920bba33e9b87027cc3d25a Mon Sep 17 00:00:00 2001
From: zeljko <zeljko@lazarus-ide.org>
Date: Sat, 15 Sep 2012 18:06:11 +0000
Subject: [PATCH] Qt: fixed crash when invalid or null handle is passed into
 SetCapture.

git-svn-id: trunk@38674 -
---
 lcl/interfaces/qt/qtwinapi.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lcl/interfaces/qt/qtwinapi.inc b/lcl/interfaces/qt/qtwinapi.inc
index 8b2d6be303..1b61d18b92 100644
--- a/lcl/interfaces/qt/qtwinapi.inc
+++ b/lcl/interfaces/qt/qtwinapi.inc
@@ -5538,7 +5538,7 @@ begin
     {$ifdef VerboseQtWinAPI}
       WriteLn('[WinAPI SetCapture] Capture = ', Result, ' New capture = ', AHandle);
     {$endif}
-    if Result <> 0 then
+    if (Result <> 0) and IsValidHandle(AHandle) then
     begin
       Message.Msg := 0;
       FillChar(Message, SizeOf(Message), 0);