From 29eeb6c2d85829edfc2c415075923d329407116a Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 26 Nov 2018 13:09:11 +0100
Subject: [PATCH] fix crash if origin feature doesn't exist when trying to
 create dependency graph

---
 src/App/Document.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/App/Document.cpp b/src/App/Document.cpp
index 67d9490c5f..f91f464058 100644
--- a/src/App/Document.cpp
+++ b/src/App/Document.cpp
@@ -537,6 +537,10 @@ void Document::exportGraphviz(std::ostream& out) const
             //setup the origin if available
             if(cs->hasExtension(App::OriginGroupExtension::getExtensionClassTypeId())) {
                 auto origin = cs->getExtensionByType<OriginGroupExtension>()->Origin.getValue();
+                if (!origin) {
+                    std::cerr << "Origin feature not found" << std::endl;
+                    return;
+                }
                 auto& osub = sub.create_subgraph();
                 GraphList[origin] = &osub;
                 get_property(osub, graph_name) = getClusterName(origin);