From e18dcef6db77d2c42aee361d7d83727c223ed0ad Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 3 May 2013 18:30:25 +0200
Subject: [PATCH] Fix crash in property editor of property link is empty

---
 src/Gui/propertyeditor/PropertyItem.cpp | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/Gui/propertyeditor/PropertyItem.cpp b/src/Gui/propertyeditor/PropertyItem.cpp
index edb518ba4..c542dc921 100644
--- a/src/Gui/propertyeditor/PropertyItem.cpp
+++ b/src/Gui/propertyeditor/PropertyItem.cpp
@@ -2111,9 +2111,24 @@ QVariant PropertyLinkItem::value(const App::Property* prop) const
     const App::PropertyLink* prop_link = static_cast<const App::PropertyLink*>(prop);
     App::DocumentObject* obj = prop_link->getValue();
     QStringList list;
-    list << QString::fromAscii(obj->getDocument()->getName());
-    list << QString::fromAscii(obj->getNameInDocument());
-    list << QString::fromUtf8(obj->Label.getValue());
+    if (obj) {
+        list << QString::fromAscii(obj->getDocument()->getName());
+        list << QString::fromAscii(obj->getNameInDocument());
+        list << QString::fromUtf8(obj->Label.getValue());
+    }
+    else {
+        App::PropertyContainer* c = prop_link->getContainer();
+        if (c->getTypeId().isDerivedFrom(App::DocumentObject::getClassTypeId())) {
+            App::DocumentObject* obj = static_cast<App::DocumentObject*>(c);
+            list << QString::fromAscii(obj->getDocument()->getName());
+        }
+        else {
+            list << QString::fromAscii("");
+        }
+        list << QString::fromAscii("Null");
+        list << QString::fromAscii("");
+    }
+
     return QVariant(list);
 }