diff --git a/YACReaderLibrary/db/treemodel.cpp b/YACReaderLibrary/db/treemodel.cpp
index d403eba8..7f14c2cc 100644
--- a/YACReaderLibrary/db/treemodel.cpp
+++ b/YACReaderLibrary/db/treemodel.cpp
@@ -256,7 +256,7 @@ void TreeModel::setupModelData(QSqlQuery &sqlquery, TreeItem *parent)
 		item->id = record.value("id").toULongLong();
 		//la inserción de hijos se hace de forma ordenada
 		TreeItem * parent = items.value(record.value("parentId").toULongLong());
-		if(parent !=0)
+		if(parent !=0) //TODO if parent==0 the parent of item was removed from the DB and delete on cascade didn't work, ERROR.
 			parent->appendChild(item);
 		//se añade el item al map, de forma que se pueda encontrar como padre en siguientes iteraciones
 		items.insert(item->id,item);
diff --git a/YACReaderLibrary/library_creator.cpp b/YACReaderLibrary/library_creator.cpp
index 8ee77109..576377e8 100644
--- a/YACReaderLibrary/library_creator.cpp
+++ b/YACReaderLibrary/library_creator.cpp
@@ -92,7 +92,7 @@ void LibraryCreator::run()
 			creation = false;
 			return;
 		}
-		//QSqlQuery pragma("PRAGMA foreign_keys = ON",_database);
+		QSqlQuery pragma("PRAGMA foreign_keys = ON",_database);
 		_database.transaction();
 		update(QDir(_source));
 		_database.commit();