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Error : TypeError: join(): Argument #1 ($array) must be of type array, string given

Backtrace:
/modules/quizmaker/class/QuizHandler.php (614)
/modules/quizmaker/blocks/quiz.php (101)
/kernel/block.php (750)
/class/theme_blocks.php (202)
/class/theme_blocks.php (130)
/class/theme_blocks.php (49)
/class/theme.php (404)
/class/theme.php (97)
/header.php (53)
/modules/glossaire/entries.php (35)
/modules/glossaire/index.php (26)