From 1d336fe72ec0838001e7a1d2322170bd2f20a300 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 7 Apr 2017 15:32:22 +0200
Subject: [PATCH] avoid possibly crash when trying to add objects to the wrong
 document

---
 src/Mod/PartDesign/Gui/Command.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/PartDesign/Gui/Command.cpp b/src/Mod/PartDesign/Gui/Command.cpp
index e52bf372f5..2c13898ecb 100644
--- a/src/Mod/PartDesign/Gui/Command.cpp
+++ b/src/Mod/PartDesign/Gui/Command.cpp
@@ -556,6 +556,10 @@ void CmdPartDesignNewSketch::activated(int iMsg)
 
         // Called by dialog when user hits "OK" and accepter returns true
         auto worker = [=](const std::vector<App::DocumentObject*>& features) {
+            // may happen when the user switched to an empty document while the
+            // dialog is open
+            if (features.empty())
+                return;
             App::Plane* plane = static_cast<App::Plane*>(features.front());
             std::string FeatName = getUniqueObjectName("Sketch");
             std::string supportString = std::string("(App.activeDocument().") + plane->getNameInDocument() +