PHP Warnings on WP Update Page

[ansonphong]

Every time loading the WordPress updates page, this warning appears:

Warning: Attempt to modify property of non-object in /packages/wp-less/wp-less.php on line 124

Warning: array_search() expects parameter 2 to be array, null given in /packages/wp-less/wp-less.php on line 125

Warning: Attempt to modify property of non-object in /packages/wp-less/wp-less.php on line 125

I've included the WP-LESS package not as a plugin, but as part of the theme itself. This only began happening recently, around WP version 4.3. It is happening in every theme and every server environment that I have which employs WP-LESS.