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

Backtrace:
/modules/xoopsfaq/include/functions-permissions.php (52)
/modules/xoopsfaq/class/category.php (200)
/modules/xoopsfaq/index-faqByCategory.php (47)
/modules/xoopsfaq/index.php (41)