Notice with PHP 7.4

Trying out the latest and greatest (WP 5.3-beta1-46340, PHP 7.4.0beta4), everything went smooth except for this one notice on the front end:

Notice: Trying to access array offset on value of type null in .../wp-content/plugins/autoptimize/classes/autoptimizeImages.php on line 178

$_userstatus is null for me at that point.

Should it be if ( is_array($_userstatus) && -2 == $_userstatus['Status'] ) { or if ( !is_array($_userstatus) || -2 == $_userstatus['Status'] ) {? Probably the latter, right? I don’t use any CDN so $do_cdn should go false?