From 842ea49a64151507d50eb9e0d3a11bd8a4f70ad6 Mon Sep 17 00:00:00 2001
From: Markus Lampert <markus@bibi.ca>
Date: Tue, 25 Jul 2017 19:02:33 -0700
Subject: [PATCH] Prevent segfault if vertex map isn't set.

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

diff --git a/src/App/Document.cpp b/src/App/Document.cpp
index 29653c8b68..48ec6ea7b8 100644
--- a/src/App/Document.cpp
+++ b/src/App/Document.cpp
@@ -2107,6 +2107,7 @@ int Document::recompute()
 
     for (std::list<Vertex>::reverse_iterator i = make_order.rbegin();i != make_order.rend(); ++i) {
         DocumentObject* Cur = d->vertexMap[*i];
+        if (!Cur || !isIn(Cur)) continue;
 
         if (recomputeList.find(Cur) != recomputeList.end() ||
                 Cur->ExpressionEngine.depsAreTouched()) {