diff --git a/src/board/UBBoardController.cpp b/src/board/UBBoardController.cpp
index dc4e1e37..5dd6fa57 100644
--- a/src/board/UBBoardController.cpp
+++ b/src/board/UBBoardController.cpp
@@ -64,7 +64,6 @@
 #include "domain/UBGraphicsGroupContainerItem.h"
 #include "domain/UBItem.h"
 #include "board/UBFeaturesController.h"
-#include "domain/UBGraphicsStrokesGroup.h"
 
 #include "gui/UBFeaturesWidget.h"
 
diff --git a/src/core/UBPersistenceManager.cpp b/src/core/UBPersistenceManager.cpp
index a3d63c12..afba962a 100644
--- a/src/core/UBPersistenceManager.cpp
+++ b/src/core/UBPersistenceManager.cpp
@@ -925,6 +925,7 @@ bool UBPersistenceManager::isEmpty(UBDocumentProxy* pDocumentProxy)
         if(empty){
             mSceneCache.removeScene(pDocumentProxy,0);
             delete theSoleScene;
+            theSoleScene = NULL;
         }
         else{
             //the scene can contain Delegate buttons and the selection frame
@@ -941,6 +942,7 @@ bool UBPersistenceManager::isEmpty(UBDocumentProxy* pDocumentProxy)
             if(!usefulItemFound){
                 mSceneCache.removeScene(pDocumentProxy,0);
                 delete theSoleScene;
+                theSoleScene = NULL;
                 empty = true;
             }
         }