Hi before this I using wp_create_user. It was working properly.

Now I change it little bit of my code to use wp_insert_user. I change because i have custom field to set but now I using standard field , email , pass and username but got problem when submit

The problem are

Notice: Trying to access array offset on value of type null in /wp-includes/user.php on line 1764
Notice: Trying to access array offset on value of type null in /wp-includes/user.php on line 1767

my code