arianfar

Hello
I have a lot of the following error in the error log file:

Error at PHP version: 7.4
PHP Notice: Trying to get property ‘post_type’ of non-object in ***/wp-includes/class-wp-query.php on line 4338

Error at PHP version: 8.0
PHP Warning: Attempt to read property “post_type” on null in ***/wp-includes/class-wp-query.php on line 4338

I put the part of the class-wp-query.php file that includes line 4338 below.

public function is_singular( $post_types = ” ) {
if ( empty( $post_types ) || ! $this->is_singular ) {
return (bool) $this->is_singular;
}
$post_obj = $this->get_queried_object();
line 4338: return in_array( $post_obj->post_type, (array) $post_types, true );
}

I’m getting similar warnings under PHP 8 and also PHP 7.4, with any urls of my website, ending with /feed/;
(the feed link gets displayed, however the warning is at the top of the page – each /feed page)
I’ve searched for that warning message on Google and I can say came up with almost hundreds of websites indexed with that warning message in the results.
So, it seems that’s a very common problem.
The warning appears only in /feed/ pages, the mentioned line in php file contains:
return in_array( $post_obj->post_type, (array) $post_types, true );

Tested at all WordPress version: 5 and up

All my WordPress and plugins and my template are up-to-date
If possible, guide me on what to do.
Thank you very much

Thanks for the answers
I want to update WooCommerce!
I do not want to clear the face of the issue.
I want to solve it with your help!

Is there no way I can use v4.4.0 instead of v4.3.3?
I am currently using version v4.3.3 but I do not want to stay in this version of woocommerce! In this case, some capabilities and security will be lost!