From 55b130d8537feaa875e9e1b0085bd4543a016322 Mon Sep 17 00:00:00 2001
From: mpv <mpv@opencascade.com>
Date: Thu, 15 Dec 2016 08:39:53 +0300
Subject: [PATCH] Fix for the issue #1928

---
 src/Model/Model_Session.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Model/Model_Session.cpp b/src/Model/Model_Session.cpp
index 4c98ca450..5bb981ea3 100644
--- a/src/Model/Model_Session.cpp
+++ b/src/Model/Model_Session.cpp
@@ -422,7 +422,8 @@ void Model_Session::processEvent(const std::shared_ptr<Events_Message>& theMessa
           }
         }
         if (!aFound) { // if not, the part was removed, so activate the module document
-          setActiveDocument(moduleDocument());
+          if (myCurrentDoc.get())
+            setActiveDocument(moduleDocument());
         }
       }
     }
-- 
2.39.2