CodeIgniter RewriteRule and ErrorDocument in .htaccess

Its seems that because of the CodeIgniter RewriteRule, the ErrorDocument option doesn't work. Anyway I can get the ErrorDocument to work

RewriteEngine on
RewriteCond %{HTTPS} !=on
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R,L]
RewriteCond %{HTTP_HOST} !^www.domainname.com$ [NC]
RewriteRule ^(.*)$ https://www.domainname.com/$1 [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ ci_index.php?/$1 [L]

ErrorDocument 404 /404.php

If it is a true error report it to the Development Team on GitHub issues.

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