Reply To: error after update to 1.3.23: strpos(): empty needle in /media.php on line 1088

[Tom]

You can use code as well, but it’s the exact same thing as using a plugin: http://wordpress.stackexchange.com/questions/211375/how-do-i-disable-responsive-images-in-wp-4-4

It seems to be a WordPress bug, but only for some server set ups.