Map Disables Contact Form

I get this when I submit anything on my contact form

“Warning: Cannot modify header information – headers already sent by (output started at /home/vortexbuilders/public_html/wp-content/plugins/comprehensive-google-map-plugin/functions.php:279) in /home/vortexbuilders/public_html/wp-includes/pluggable.php on line 896”

https://ww.wp.xz.cn/plugins/comprehensive-google-map-plugin/