Newsletter and special caracters into templates

Error when trying to send (create/send tab) templates with special characters (accented letters and apostrophe).

PDOException : SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'entity_id' cannot be null: INSERT INTO {field_data_field_newsletter_body} (entity_type, entity_id, revision_id, bundle, delta, language, field_newsletter_body_value, field_newsletter_body_summary, field_newsletter_body_format) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8); Array ( [:db_insert_placeholder_0] => newsletter_newsletter [:db_insert_placeholder_1] => [:db_insert_placeholder_2] => [:db_insert_placeholder_3] => newsletter_newsletter [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => und [:db_insert_placeholder_6] => [:db_insert_placeholder_7] => [:db_insert_placeholder_8] => ) dans field_sql_storage_field_storage_write() (line 448 in /var/www/vhosts/.../httpdocs/modules/field/modules/field_sql_storage/field_sql_storage.module)

I have uninstalled and removed completely newsletter module then reinstall it. It works fine until I create/modify templates with special characters.