Fatal error with function get_duration()

I have an error on the page /profile/user/quizzes/.
Could you fix this please?
Error code:
Fatal error: Uncaught Error: Call to a member function get_duration() on bool in C:\OpenServer\domains\theme\wp-content\plugins\learnpress\inc\user-item\class-lp-user-item-quiz.php:615 Stack trace: #0 C:\OpenServer\domains\theme\wp-content\plugins\learnpress\templates\profile\tabs\quizzes.php(95): LP_User_Item_Quiz->get_time_interval() #1 C:\OpenServer\domains\theme\wp-content\plugins\learnpress\inc\user\class-lp-profile.php(128): include('C:\\OpenServer\\d...') #2 C:\OpenServer\domains\theme\wp-includes\class-wp-hook.php(307): LP_Profile->output() #3 C:\OpenServer\domains\theme\wp-includes\class-wp-hook.php(331): WP_Hook->apply_filters() #4 C:\OpenServer\domains\theme\wp-includes\plugin.php(476): WP_Hook->do_action() #5 C:\OpenServer\domains\theme\wp-content\plugins\learnpress\templates\profile\content.php(29): do_action() #6 C:\OpenServer\domains\theme\wp-content\plugins\learnpress\inc\lp-template-functions.php(850): include('C:\\OpenServer\\d...') in C:\OpenServer\domains\theme\wp-content\plugins\learnpress\inc\user-item\class-lp-user-item-quiz.php on line 615