Good night, I tried to put in service ccomment core on my joomla page (Joomla! 3.9.18 Stable [ Amani ] 21-April-2020) and I got warnings when the articles are presented and when I try to write a comment. I uninstalled and installed a couple of times and the result is the same.
I also found some advices about to enter in the component and save and close it, but nothing changes.
The warning lines, in the head of the content area, when articles are loaded, are (it seems to me one per article):

Warning: array_intersect(): Argument #1 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 109

Warning: array_intersect(): Argument #1 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 109

Warning: array_intersect(): Argument #1 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 109

Warning: array_intersect(): Argument #1 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 109

Warning: array_intersect(): Argument #1 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 109

Warning: array_intersect(): Argument #1 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 109

And later when I try to write (just when I write the first character) is, under the comment box:

Warning: array_intersect(): Argument #2 is not an array in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 277

Warning: count(): Parameter must be an array or an object that implements Countable in /home/u420484022/public_html/luckiness/components/com_comment/helpers/security.php on line 277