Module PS4 : $namespace of constructor must be a string

[jerrywham]

Actually, by default it is null :

	public function __construct($baseDir, $namespace = null) {

but it must be a string because of trim function :

		$this->namespace = trim($namespace, '\\');

So constructor must be defined by :

	public function __construct($baseDir, $namespace = '') {

[garrettw]

Have you tried adding a string typehint to the constructor param? Or replacing the whole param with just ?string $namespace?
Also you probably shouldn't be trimming $namespace without first checking that it's not null.