Errors -- access array on value of null / property of non object

[jeremyfiel]

PHP Notice: Trying to access array offset on value of type null in C:\Users\jeremy\D
ownloads\MegaDownloader\draft.php on line 57
PHP Notice: Trying to get property 'at' of non-object in C:\Users\jeremy\Downlo
ads\MegaDownloader\draft.php on line 57

Hi Guys.. any help to understand these errors. thanks!

i'm using php7.4
i'm guessing this comment may have something to do with it.
laravel/framework#30737 (comment)