From 9faa7fc57f19c8d06261ead8872a668ff95646b3 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Tue, 7 Aug 2018 15:23:56 +0200
Subject: [PATCH] fix exception raised on project load for invalid enums

---
 src/App/PropertyStandard.cpp           | 5 +++++
 src/App/PropertyStandard.h             | 3 +++
 src/Gui/ViewProviderDocumentObject.cpp | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/App/PropertyStandard.cpp b/src/App/PropertyStandard.cpp
index 554a537c7b..856dadc5fc 100644
--- a/src/App/PropertyStandard.cpp
+++ b/src/App/PropertyStandard.cpp
@@ -377,6 +377,11 @@ const char ** PropertyEnumeration::getEnums(void) const
     return _enum.getEnums();
 }
 
+bool PropertyEnumeration::isValid(void) const
+{
+    return _enum.isValid();
+}
+
 void PropertyEnumeration::Save(Base::Writer &writer) const
 {
     writer.Stream() << writer.ind() << "<Integer value=\"" <<  _enum.getInt() <<"\"";
diff --git a/src/App/PropertyStandard.h b/src/App/PropertyStandard.h
index 49b47cb89d..e924ed96d1 100644
--- a/src/App/PropertyStandard.h
+++ b/src/App/PropertyStandard.h
@@ -185,6 +185,9 @@ public:
 
     /// get the pointer to the enum list
     const char ** getEnums(void) const;
+
+    /// Returns true if the instance is in a usable state
+    bool isValid(void) const;
     //@}
 
     const char* getEditorName(void) const { return _editorTypeName.c_str(); }
diff --git a/src/Gui/ViewProviderDocumentObject.cpp b/src/Gui/ViewProviderDocumentObject.cpp
index 64e0c0759b..cf355ac7f8 100644
--- a/src/Gui/ViewProviderDocumentObject.cpp
+++ b/src/Gui/ViewProviderDocumentObject.cpp
@@ -278,7 +278,7 @@ SoNode* ViewProviderDocumentObject::findFrontRootOfType(const SoType& type) cons
 
 void ViewProviderDocumentObject::setActiveMode()
 {
-    if (DisplayMode.getEnums()) {
+    if (DisplayMode.isValid()) {
         const char* mode = DisplayMode.getValueAsString();
         if (mode)
             setDisplayMode(mode);