From dd0b7144f82ea9a940e35af5caaf031abffc1a87 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Tr=C3=B6ger?= <stefantroeger@gmx.net>
Date: Fri, 23 Dec 2016 09:39:12 +0100
Subject: [PATCH] Extensions: Fix wrong group test and prevent crash

---
 src/App/GeoFeatureGroupExtension.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/App/GeoFeatureGroupExtension.h b/src/App/GeoFeatureGroupExtension.h
index bc7637152..901b34bcf 100644
--- a/src/App/GeoFeatureGroupExtension.h
+++ b/src/App/GeoFeatureGroupExtension.h
@@ -73,7 +73,8 @@ public:
 
     /// Returns true if the given DocumentObject is DocumentObjectGroup but not GeoFeatureGroup
     static bool isNonGeoGroup(const DocumentObject* obj) {
-        return obj->hasExtension(GroupExtension::getExtensionClassTypeId());
+        return obj->hasExtension(GroupExtension::getExtensionClassTypeId()) & 
+               !obj->hasExtension(GeoFeatureGroupExtension::getExtensionClassTypeId());
     }
 };