When opening /course/defaultcompletion.php?id=1

in moodle 4.4

the following error is thrown:

Fatal error: Cannot redeclare game_get_moodle_version() (previously declared in /mod/game/locallib.php:55) in /mod/game/locallib.php on line 55

Solution:

mod_form.php
require( 'locallib.php');

should be:
require_once( 'locallib.php');