diff --git a/Modules/BoundingShape/src/DataManagement/mitkBoundingShapeObjectFactory.cpp b/Modules/BoundingShape/src/DataManagement/mitkBoundingShapeObjectFactory.cpp
index a700c9bed7..18db2cf3b6 100644
--- a/Modules/BoundingShape/src/DataManagement/mitkBoundingShapeObjectFactory.cpp
+++ b/Modules/BoundingShape/src/DataManagement/mitkBoundingShapeObjectFactory.cpp
@@ -1,94 +1,94 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #include "mitkBoundingShapeObjectFactory.h"
 #include "mitkBoundingShapeVtkMapper2D.h"
 #include "mitkBoundingShapeVtkMapper3D.h"
 #include <mitkCoreObjectFactory.h>
 
 mitk::BoundingShapeObjectFactory::BoundingShapeObjectFactory()
 {
 }
 
 mitk::BoundingShapeObjectFactory::~BoundingShapeObjectFactory()
 {
 }
 
 mitk::Mapper::Pointer mitk::BoundingShapeObjectFactory::CreateMapper(mitk::DataNode *node, MapperSlotId slotId)
 {
   Mapper::Pointer mapper;
 
   if (dynamic_cast<GeometryData *>(node->GetData()) != nullptr)
   {
     if (slotId == BaseRenderer::Standard2D)
     {
       mapper = BoundingShapeVtkMapper2D::New();
     }
     else if (slotId == BaseRenderer::Standard3D)
     {
       mapper = BoundingShapeVtkMapper3D::New();
     }
 
     if (mapper.IsNotNull())
       mapper->SetDataNode(node);
   }
 
   return mapper;
 }
 
 const char *mitk::BoundingShapeObjectFactory::GetDescription() const
 {
   return "BoundingShape Object Factory";
 }
 
 std::string mitk::BoundingShapeObjectFactory::GetFileExtensions()
 {
-  return nullptr;
+  return "";
 }
 
 mitk::CoreObjectFactoryBase::MultimapType mitk::BoundingShapeObjectFactory::GetFileExtensionsMap()
 {
   return MultimapType();
 }
 
 std::string mitk::BoundingShapeObjectFactory::GetSaveFileExtensions()
 {
-  return nullptr;
+  return "";
 }
 
 mitk::CoreObjectFactoryBase::MultimapType mitk::BoundingShapeObjectFactory::GetSaveFileExtensionsMap()
 {
   return MultimapType();
 }
 
 void mitk::BoundingShapeObjectFactory::SetDefaultProperties(mitk::DataNode *node)
 {
   if (node == nullptr)
     return;
 
   if (dynamic_cast<GeometryData *>(node->GetData()) != nullptr)
   {
     BoundingShapeVtkMapper2D::SetDefaultProperties(node);
     BoundingShapeVtkMapper3D::SetDefaultProperties(node);
   }
 }
 
 void mitk::RegisterBoundingShapeObjectFactory()
 {
   static bool alreadyRegistered = false;
 
   if (!alreadyRegistered)
   {
     CoreObjectFactory::GetInstance()->RegisterExtraFactory(BoundingShapeObjectFactory::New());
     alreadyRegistered = true;
   }
 }