Error

Hi
I am using
wordpress 4.9.6 php version 5.6.32
if I activate the plugin and update or modify pages I have these errors
if you turn it off, everything is ok
how can I solve it?
regards
sandro

Warning: array_filter() expects parameter 1 to be array, string given in /home/xx/public_html/wp-content/plugins/gdpr/admin/class-gdpr-admin.php on line 769

Warning: Cannot modify header information – headers already sent by (output started at /home/erositalia/public_html/wp-content/plugins/gdpr/admin/class-gdpr-admin.php:769) in /home/xxx/public_html/wp-admin/post.php on line 198