Trying to get property ‘comment_status’ of non-objec

Here is my error message.(wordpress version is 5.4.2)
PHP Notice: Trying to get property’comment_status’ of non-object in public_html/wp-includes/comment-template.php on line 1243

This is the source code.

function comments_open( $post_id = null ) {

$_post = get_post( $post_id );

$post_id = $_post ? $_post->ID : 0;
$open    = ( 'open' == $_post->comment_status );  // line 1243

There is only one error occurring, no other errors.
How can I fix this?

• This topic was modified 4 years, 6 months ago by blackdeth73.
• This topic was modified 4 years, 6 months ago by blackdeth73.