From b4ebe1960f8443c465d020b96a7f6a3724165516 Mon Sep 17 00:00:00 2001
From: mpv <mikhail.ponikarov@opencascade.com>
Date: Mon, 13 Apr 2020 09:25:27 +0300
Subject: [PATCH] Fix for the issue #3205 : SIGSEGV in Break link with branch
 occ/modificationByFeatures

Store the old selection in groups and fields to use it in break link
---
 src/ModelAPI/ModelAPI_Tools.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ModelAPI/ModelAPI_Tools.cpp b/src/ModelAPI/ModelAPI_Tools.cpp
index de4c97ccd..19b101865 100644
--- a/src/ModelAPI/ModelAPI_Tools.cpp
+++ b/src/ModelAPI/ModelAPI_Tools.cpp
@@ -1105,11 +1105,15 @@ std::list<FeaturePtr> referencedFeatures(
 std::shared_ptr<ModelAPI_Result> singleEvolution(const std::string theEntry)
 {
   ResultPtr aRes;
+  if (theEntry.empty())
+    return aRes;
   std::size_t aFirstColon = theEntry.find(":");
   if (aFirstColon == std::string::npos)
     return aRes;
   // searching a part
   std::string aPartIdStr = theEntry.substr(0, aFirstColon);
+  if (aPartIdStr.size() > 1 && aPartIdStr[0] == 'd')
+    return aRes;
   int aPartId = std::stoi(aPartIdStr);
   SessionPtr aSession = ModelAPI_Session::get();
   DocumentPtr aRoot = aSession->moduleDocument();
-- 
2.39.2