From 8f1767115cfe00369c8ce6c5772397484c958db9 Mon Sep 17 00:00:00 2001
From: mkr <mkr@opencascade.com>
Date: Mon, 4 Jul 2005 11:46:54 +0000
Subject: [PATCH] Fix for bug IPAL9369 : 3.0.0 (debianex: INSTALL2): CRASH
 after link deletion of the running dataflow.

---
 src/SUPERVGUI/SUPERVGUI_CanvasLink.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/SUPERVGUI/SUPERVGUI_CanvasLink.cxx b/src/SUPERVGUI/SUPERVGUI_CanvasLink.cxx
index 4855b18..955d3b8 100644
--- a/src/SUPERVGUI/SUPERVGUI_CanvasLink.cxx
+++ b/src/SUPERVGUI/SUPERVGUI_CanvasLink.cxx
@@ -214,6 +214,10 @@ void SUPERVGUI_CanvasLink::setColor(const QColor& theColor)
 }
 
 void SUPERVGUI_CanvasLink::remove() {
+  // IPAL9369 : check the dataflow readiness to modify
+  if ( !myMain->ReadyToModify() ) // null dataflow or executing, ..
+    return;
+
   myMain->Editing(); // PAL6170: GUI->Engine: setting "Editing" flag 
 
   QString aValue;
-- 
2.39.2