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Error: Call to a member function addScript() on null

File: /home/impresscms/domains/impresscms.org/public_html/beta/plugins/preloads/cookie.php

Line: 16

Backtrace:
/libraries/icms/preload/Handler.php (162)
/footer.php (60)
/libraries/icms/module/Handler.php (424)
/libraries/icms.php (198)
/libraries/icms.php (146)
/libraries/icms.php (165)
/include/common.php (112)
/mainfile.php (123)
/modules/simplywiki/header.php (15)
/modules/simplywiki/index.php (16)