From 1d03c1e653a7aff84097c2dee30b8fd8b091160f Mon Sep 17 00:00:00 2001
From: fvogel <fvogelnew1@free.fr>
Date: Fri, 10 Feb 2023 18:27:59 +0000
Subject: Fix [https://core.tcl-lang.org/tcl/tktview/170551eeffef|170551eeff]
 (from the Tcl repository): Crash in tk busy forget.

---
 generic/tkBusy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/generic/tkBusy.c b/generic/tkBusy.c
index 32db4fc..82b4032 100644
--- a/generic/tkBusy.c
+++ b/generic/tkBusy.c
@@ -686,8 +686,8 @@ GetBusy(
     Tcl_HashEntry *hPtr;
     Tk_Window tkwin;
 
-    if (TkGetWindowFromObj(interp, Tk_MainWindow(interp), windowObj,
-	    &tkwin) != TCL_OK) {
+    tkwin = Tk_MainWindow(interp);
+    if (!tkwin || (TkGetWindowFromObj(interp, tkwin, windowObj, &tkwin) != TCL_OK)) {
 	return NULL;
     }
     hPtr = Tcl_FindHashEntry(busyTablePtr, (char *) tkwin);
-- 
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