From ec76306b0a0f568eaad143e13c094d66cc05ecaa Mon Sep 17 00:00:00 2001
From: nagai <nagai@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 31 Aug 2004 03:32:33 +0000
Subject: * ext/tcltklib/tcltklib.c (del_root): fix SEGV

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6840 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/tcltklib/tcltklib.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'ext/tcltklib')

diff --git a/ext/tcltklib/tcltklib.c b/ext/tcltklib/tcltklib.c
index 0217ab8feb..84a999d7e4 100644
--- a/ext/tcltklib/tcltklib.c
+++ b/ext/tcltklib/tcltklib.c
@@ -2781,8 +2781,13 @@ ip_thread_tkwait(self, mode, target)
 VALUE del_root(ip)
     Tcl_Interp *ip;
 {
+    Tk_Window main_win;
+
     Tcl_Preserve(ip);
-    Tk_DestroyWindow(Tk_MainWindow(ip));
+    main_win = Tk_MainWindow(ip);
+    if (main_win != (Tk_Window)NULL) {
+	Tk_DestroyWindow(main_win);
+    }
     Tcl_Release(ip);
     return Qnil;
 }
-- 
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