Course restore failure on calendar events

Restore course to a new course.

Conversions of name and modulename seem to be required.

Type - Course
Format - Moodle 2
Mode - General
Date taken - Tuesday, 5 November 2013, 1:08 PM

Moodle version - 2.5.2+ (Build: 20131101)[2013051402.11]

Backup version - 2.5[2013051400]

Debug info: The data types ntext and nvarchar are incompatible in the equal to operator.
SELECT TOP 1 id FROM mdl_event WHERE name = ? AND courseid = ? AND
repeatid = ? AND modulename = ? AND timestart = ? AND timeduration =?
AND CONVERT(varchar(255), description) = CONVERT(varchar(255), ?)

Error code: dmlreadexception

Stack trace: •line 423 of \lib\dml\moodle_database.php: dml_read_exception thrown
•line 256 of \lib\dml\mssql_native_moodle_database.php: call to moodle_database->query_end()
•line 723 of \lib\dml\mssql_native_moodle_database.php: call to mssql_native_moodle_database->query_end()
•line 1689 of \lib\dml\moodle_database.php: call to mssql_native_moodle_database->get_recordset_sql()
•line 2204 of \backup\moodle2\restore_stepslib.php: call to moodle_database->record_exists_sql()
•line 131 of \backup\util\plan\restore_structure_step.class.php: call to restore_calendarevents_structure_step->process_calendarevents()
•line 103 of \backup\util\helper\restore_structure_parser_processor.class.php: call to restore_structure_step->process()
•line 151 of \backup\util\xml\parser\processors\grouped_parser_processor.class.php: call to restore_structure_parser_processor->dispatch_chunk()
•line 91 of \backup\util\helper\restore_structure_parser_processor.class.php: call to grouped_parser_processor->postprocess_chunk()
•line 148 of \backup\util\xml\parser\processors\simplified_parser_processor.class.php: call to restore_structure_parser_processor->postprocess_chunk()
•line 92 of \backup\util\xml\parser\processors\progressive_parser_processor.class.php: call to simplified_parser_processor->process_chunk()
•line 169 of \backup\util\xml\parser\progressive_parser.class.php: call to progressive_parser_processor->receive_chunk()
•line 253 of \backup\util\xml\parser\progressive_parser.class.php: call to progressive_parser->publish()
•line ? of unknownfile: call to progressive_parser->end_tag()
•line 158 of \backup\util\xml\parser\progressive_parser.class.php: call to xml_parse()
•line 137 of \backup\util\xml\parser\progressive_parser.class.php: call to progressive_parser->parse()
•line 105 of \backup\util\plan\restore_structure_step.class.php: call to progressive_parser->process()
•line 153 of \backup\util\plan\base_task.class.php: call to restore_structure_step->execute()
•line 192 of \backup\moodle2\restore_activity_task.class.php: call to base_task->execute()
•line 167 of \backup\util\plan\base_plan.class.php: call to restore_activity_task->execute()
•line 157 of \backup\util\plan\restore_plan.class.php: call to base_plan->execute()
•line 315 of \backup\controller\restore_controller.class.php: call to restore_plan->execute()
•line 147 of \backup\util\ui\restore_ui.class.php: call to restore_controller->execute_plan()
•line 46 of \backup\restore.php: call to restore_ui->execute()