Error: in_array(): Argument #2 ($haystack) must be of type array, null given

• /srv/code/openfun.app/lawtrace/libraries/LawHistoryHelper.php:456
• /srv/code/openfun.app/lawtrace/libraries/LawHistoryHelper.php:456
• /srv/code/openfun.app/lawtrace/libraries/LawHistoryHelper.php:18
• /srv/code/openfun.app/lawtrace/controllers/LawController.php:122
• /srv/code/openfun.app/lawtrace/mini-engine.php:285
• /srv/code/openfun.app/lawtrace/mini-engine.php:249
• /srv/code/openfun.app/lawtrace/index.php:4