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Error : TypeError: chr() expects parameter 1 to be int, string given

Backtrace:
/modules/publisher/class/Metagen.php (439)
/modules/publisher/class/Metagen.php (441)
/modules/publisher/class/Metagen.php (90)
/modules/publisher/class/Metagen.php (77)
/modules/publisher/item.php (278)
/modules/publisher/include/seo.inc.php (74)
/modules/publisher/header.php (33)
/modules/publisher/index.php (31)