From 2047f12675560e2447b4a3ab55d85a8b5e5ccf40 Mon Sep 17 00:00:00 2001
From: asl <asl@opencascade.com>
Date: Thu, 22 Oct 2015 13:30:49 +0300
Subject: [PATCH] patch on crash in old study

---
 src/HYDROData/HYDROData_Entity.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/HYDROData/HYDROData_Entity.cxx b/src/HYDROData/HYDROData_Entity.cxx
index 99667f31..f0b9e5fb 100644
--- a/src/HYDROData/HYDROData_Entity.cxx
+++ b/src/HYDROData/HYDROData_Entity.cxx
@@ -165,6 +165,8 @@ void HYDROData_Entity::Changed( Geometry theChangedGeometry )
   for ( ; anIter.More(); anIter.Next() )
   {
     Handle(HYDROData_Entity) anObject = anIter.Current();
+    if( anObject.IsNull() )
+      continue;
     HYDROData_SequenceOfObjects aRefSeq = anObject->GetAllReferenceObjects();
     for ( int i = 1, n = aRefSeq.Length(); i <= n; ++i )
     {
-- 
2.39.2