From 2bd7511e7a07aac88788bc9cceac1613d07885b1 Mon Sep 17 00:00:00 2001
From: Artem Zhidkov <Artem.Zhidkov@opencascade.com>
Date: Wed, 20 May 2020 16:50:14 +0300
Subject: [PATCH] Issue #3255: Access violation deleting parameters

---
 src/XGUI/XGUI_Workshop.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/XGUI/XGUI_Workshop.cpp b/src/XGUI/XGUI_Workshop.cpp
index 37bbb612d..274964c1d 100644
--- a/src/XGUI/XGUI_Workshop.cpp
+++ b/src/XGUI/XGUI_Workshop.cpp
@@ -1956,7 +1956,7 @@ void XGUI_Workshop::deleteObjects()
     ResultConstructionPtr aConstr = std::dynamic_pointer_cast<ModelAPI_ResultConstruction>(aObj);
     FeaturePtr aFeature = ModelAPI_Feature::feature(aObj);
     if (aFeature) {
-      notDelete = (!aFeature->isInHistory()) && aConstr->isInfinite();
+      notDelete = (!aFeature->isInHistory()) && (aConstr && aConstr->isInfinite());
       if (notDelete) {
         anObjects.removeAll(aObj);
         aIt--;
-- 
2.39.2