NullPointerException in URLPermission.hashCode()

Mistake in the operator precdence causes NPE using test shown below:

import java.net.URLPermission;
import java.security.PermissionCollection;
import java.security.Permissions;

public class Test {
    public static void main(String[] args) {
        PermissionCollection perms = new Permissions();
        perms.add(new URLPermission("http:*", "*:*"));
        System.out.println(perms);
    }
}