Hello,
We've found following error in Moodle.
When we backup course and then try to restore it, restore fails because of the "Vocabulary Game" activity.
As I understand this error is related to the Game plug-in.

Here is debug info of this error:
Debug info: Field 'id' doesn't have a default value
INSERT INTO mdl_game_export_html (filename,title,checkbutton,printbutton,inputsize,maxpicturewidth,maxpictureheight) VALUES(?,?,?,?,?,?,?)
[array (
0 => NULL,
1 => NULL,
2 => '1',
3 => '1',
4 => NULL,
5 => NULL,
6 => NULL,
)]
Error code: dmlwriteexception
Stack trace:

line 477 of /lib/dml/moodle_database.php: dml_write_exception thrown
line 1172 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
line 1218 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->insert_record_raw()
line 85 of /mod/game/backup/moodle2/restore_game_stepslib.php: call to mysqli_native_moodle_database->insert_record()
line 137 of /backup/util/plan/restore_structure_step.class.php: call to restore_game_activity_structure_step->process_game_export_html()
line 103 of /backup/util/helper/restore_structure_parser_processor.class.php: call to restore_structure_step->process()
line 178 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 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 110 of /backup/util/plan/restore_structure_step.class.php: call to progressive_parser->process()
line 181 of /backup/util/plan/base_task.class.php: call to restore_structure_step->execute()
line 201 of /backup/moodle2/restore_activity_task.class.php: call to base_task->execute()
line 177 of /backup/util/plan/base_plan.class.php: call to restore_activity_task->execute()
line 167 of /backup/util/plan/restore_plan.class.php: call to base_plan->execute()
line 335 of /backup/controller/restore_controller.class.php: call to restore_plan->execute()
line 224 of /backup/util/ui/restore_ui.class.php: call to restore_controller->execute_plan()
line 111 of /backup/restore.php: call to restore_ui->execute()

Thank you!