Fix migration see BT#11399

app/Migrations/Schema/V111/Version20160603113100.php

@@ -21,12 +21,9 @@ class Version20160603113100 extends AbstractMigrationChamilo
      */
     public function up(Schema $schema)
     {
-        $languageTable = $schema->getTable('language');
-        $languageTable
-            ->getColumn('parent_id')
-            ->setType(Type::getType(Type::INTEGER))
-            ->setNotnull(false);
-        $languageTable->addForeignKeyConstraint('language', ['parent_id'], ['id'], [], 'language_parent');
+        $this->addSql('ALTER TABLE language MODIFY id INT');
+        $this->addSql('ALTER TABLE language MODIFY parent_id INT');
+        $this->addSql('ALTER TABLE language ADD CONSTRAINT language_parent FOREIGN KEY (parent_id) REFERENCES language (id)');
     }
 
     /**

src/Chamilo/CoreBundle/Entity/Language.php

@@ -19,7 +19,7 @@ class Language
      *
      * @ORM\Column(name="id", type="integer")
      * @ORM\Id
-     * @ORM\GeneratedValue(strategy="IDENTITY")
+     * @ORM\GeneratedValue
      */
     private $id;