line 677 of /lib/dml/moodle_database.php: dml_exception thrown

line 1603 of /lib/dml/moodle_database.php: call to moodle_database->where_clause()

line 91 of /mod/lti/backup/moodle1/lib.php: call to moodle_database->get_field()

line 299 of /backup/converter/moodle1/lib.php: call to moodle1_mod_lti_handler->process_basiclti()

line 751 of /backup/converter/moodle1/lib.php: call to moodle1_converter->process_chunk()

line 178 of /backup/util/xml/parser/processors/grouped_parser_processor.class.php: call to moodle1_parser_processor->dispatch_chunk()

line 148 of /backup/util/xml/parser/processors/simplified_parser_processor.class.php: call to grouped_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 190 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser_processor->receive_chunk()

line 278 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser->publish()

line ? of unknownfile: call to progressive_parser->end_tag()

line 179 of /backup/util/xml/parser/progressive_parser.class.php: call to xml_parse()

line 158 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser->parse()

line 150 of /backup/converter/moodle1/lib.php: call to progressive_parser->process()

line 129 of /backup/converter/convertlib.php: call to moodle1_converter->execute()

line 209 of /backup/util/helper/convert_helper.class.php: call to base_converter->convert()

line 462 of /backup/controller/restore_controller.class.php: call to convert_helper::to_moodle2_format()

line 92 of /backup/restore.php: call to restore_controller->convert()