diff --git a/source/app.d b/source/app.d
index 71c1118..43f99ff 100644
--- a/source/app.d
+++ b/source/app.d
@@ -104,10 +104,11 @@ void main(string[] args)
 	tree.addOnColumnsChanged((TreeView tree){
 		auto store = cast(ListStore)tree.getModel();
 
-		if(store.getColumnType(GetColumnStoreIndex(tree, 0)) != GType.INT){
-			writeln("Position 0 is forbidden");
+		int si = GetColumnStoreIndex(tree, 0);
+		if(si>=0 && store.getColumnType(si) != GType.INT){
 			foreach(i ; 0..store.getNColumns()){
-				if(store.getColumnType(GetColumnStoreIndex(tree, i))==GType.INT){
+				si = GetColumnStoreIndex(tree, i);
+				if(si>=0 && store.getColumnType(si)==GType.INT){
 					tree.moveColumnAfter(tree.getColumn(i), null);
 					break;
 				}
@@ -192,11 +193,6 @@ void main(string[] args)
 		auto store = new ListStore(types);
 		tree.setModel(store);
 
-		//setup cols
-		foreach(i ; 0..newColIndex+1){
-			tree.appendColumn(SetupColumn(tree, titles[i], i));
-		}
-
 		//Fill them
 		TreeIter oldit = new TreeIter();
 		TreeIter newit = new TreeIter();
@@ -217,6 +213,11 @@ void main(string[] args)
 			}while(oldstore.iterNext(oldit));
 		}
 
+		//setup cols
+		foreach(i ; 0..newColIndex+1){
+			tree.appendColumn(SetupColumn(tree, titles[i], i));
+		}
+
 		oldstore.destroy();
 	});
 
@@ -235,7 +236,10 @@ void main(string[] args)
 }
 
 int GetColumnStoreIndex(TreeView tree, int colindex){
-	return cast(int)(tree.getColumn(colindex).getData("colnumber"));
+	auto col = tree.getColumn(colindex);
+	if(col !is null)
+		return cast(int)(col.getData("colnumber"));
+	return -1; 
 }
 
 void Save(ref TreeView tree){