Application Error: Warning: [/app/vendor/atk4/atk4/lib/<b>Page.php</b>:140]array_unshift() expects parameter 1 to be array, null given

ErrorException, code: 0

Stack trace:
File Object NameStack Trace
/: Loggererror_handler(2, "array_unshift() expects parameter 1 to be array, null given", "/app/vendor/atk4/atk4/lib/Page.php", 140, Array(3))
/app/vendor/atk4/atk4/lib/Page.php:140 Loggerarray_unshift(Null, Array(2))
/app/frontend/page/intro.php:10 Logger->addCrumb("Intro", "/intro")
/app/vendor/atk4/atk4/lib/App/Frontend.php:123 Logger->subPageHandler("dependencies")
/app/vendor/atk4/atk4/lib/App/Web.php:435 Logger->layout_Content()
/app/vendor/atk4/atk4/lib/App/Frontend.php:38 Logger->addLayout("Content")
/app/vendor/atk4/atk4/lib/App/Web.php:261 Logger->initLayout()
/app/frontend/public/index.php:9 Logger->main()

Note: To hide this information from your users, add $config['logger']['web_output']=false to your config.php file. Refer to documentation on 'Logger' for alternative logging options