Quiz hung up issue when correct answered entered for multichoice with max score added as 0

The quiz hung up when the correct answer was entered for multichoice with the max score added as 0. And on the logs shows the below error.

TypeError: Unsupported operand types: string * int in Drupal\quiz\Entity\QuizQuestion::getAnsweringFormValidate() (line 147 of /code/web/modules/contrib/quiz/src/Entity/QuizQuestionEntityTrait.php)