Debug info: Duplicate entry '3-8' for key 'mdl_courmoducomp_usecou_uix'

INSERT INTO mdl_course_modules_completion (userid,completionstate,viewed,timemodified,coursemoduleid) VALUES(?,?,?,?,?)

[array (

0 => '3',

1 => '1',

2 => '0',

3 => 1322192283,

4 => 8,

)]

Stack trace:

    line 397 of /lib/dml/moodle_database.php: dml_write_exception thrown

    line 893 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()

    line 935 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->insert_record_raw()

    line 2489 of /backup/moodle2/restore_stepslib.php: call to mysqli_native_moodle_database->insert_record()

    line 131 of /backup/util/plan/restore_structure_step.class.php: call to restore_userscompletion_structure_step->process_completion()

    line 103 of /backup/util/helper/restore_structure_parser_processor.class.php: call to restore_structure_step->process()

    line 125 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 182 of /backup/moodle2/restore_activity_task.class.php: call to base_task->execute()

    line 148 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 302 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()