执行`\EasyWeChat::miniProgram()`报错

执行\EasyWeChat::miniProgram()报错：

vagrant@homestead:~/Code/larabbs$ php artisan tinker
Psy Shell v0.9.9 (PHP 7.2.11-4+ubuntu18.04.1+deb.sury.org+1 — cli) by Justin Hileman
>>> $miniProgram = \EasyWeChat::miniProgram();
PHP Warning:  Illegal offset type in isset or empty in /home/vagrant/Code/larabbs/vendor/symfony/event-dispatcher/EventDispatcher.php on line 56