Get node field

Error message

• Notice: Undefined index: HTTP_ACCEPT in simple_mobile_redirect_boot() (line 128 of /var/www/vhosts/jmcouillard.com/httpdocs/www.danslabouche.ca/sites/all/modules/simple_mobile_redirect/simple_mobile_redirect.module).
• Notice: Undefined index: HTTP_ACCEPT in simple_mobile_redirect_boot() (line 128 of /var/www/vhosts/jmcouillard.com/httpdocs/www.danslabouche.ca/sites/all/modules/simple_mobile_redirect/simple_mobile_redirect.module).