Error notice upon saving

I am getting a notice when saving (“Publish”) after I edited my image:
Notice: Undefined index: post in /mnt/web216/c1/74/56167274/htdocs/WordPress_03/wp-content/plugins/draw-attention/admin/class-drawattention-admin.php on line 356 Warning: Cannot modify header information - headers already sent by (output started at /mnt/web216/c1/74/56167274/htdocs/WordPress_03/wp-content/plugins/draw-attention/admin/class-drawattention-admin.php:356) in /mnt/web216/c1/74/56167274/htdocs/WordPress_03/wp-includes/pluggable.php on line 1210
The notice is full screen, but I can return to my work space by pressing the browser’s return button. And the plugin and any edits work fine on the frontend.
Should I ignore that notice?