PHP コンパイル エラー:「配列内で空の配列要素は使用できません」質問する

私はLaravel 5プロジェクトでbepsvpt/セキュアヘッダー次の設定ファイルを含むパッケージ:

config/secure-headers.php

<?php

return [
    'x-content-type-options' => 'nosniff',
    'x-download-options' => 'noopen',
    'x-frame-options' => 'sameorigin',
    'x-permitted-cross-domain-policies' => 'none',
    'x-xss-protection' => '1; mode=block',

    /*
     * Referrer-Policy
     *
     * Reference: https://w3c.github.io/webappsec-referrer-policy
     *
     * Available Value: 'no-referrer', 'no-referrer-when-downgrade', 'origin', 'origin-when-cross-origin',
     *                  'same-origin', 'strict-origin', 'strict-origin-when-cross-origin', 'unsafe-url'
     */

    'referrer-policy' => 'strict-origin-when-cross-origin',

    'hsts' => [
        'enable' => env('SECURITY_HEADER_HSTS_ENABLE', false),
        'max-age' => 15552000,
        'include-sub-domains' => false,
    ],

    /*
     * Content Security Policy
     *
     * Reference: https://developer.mozilla.org/en-US/docs/Web/Security/CSP
     *
     * csp will be ignored if custom-csp is not null.
     *
     * Note: custom-csp does not support report-only.
     */

    'custom-csp' => env('SECURITY_HEADER_CUSTOM_CSP', null),

    'csp' => [
        'report-only' => false,

        'report-uri' => env('CONTENT_SECURITY_POLICY_REPORT_URI', false),,

        'upgrade-insecure-requests' => false,

        'base-uri' => [
            //
        ],

        'default-src' => [
            //
        ],

        'child-src' => [
            //
        ],

        'script-src' => [
            'allow' => [
                //
            ],

            'hashes' => [
                // ['sha256' => 'hash-value'],
            ],

            'nonces' => [
                //
            ],

            'self' => false,

            'unsafe-inline' => false,

            'unsafe-eval' => false,
        ],

        'style-src' => [
            'allow' => [
                //
            ],

            'self' => false,

            'unsafe-inline' => false,
        ],

        'img-src' => [
            'allow' => [
                //
            ],

            'types' => [
                //
            ],

            'self' => false,

            'data' => false,
        ],

        /*
         * The following directives are all use 'allow' and 'self' flag.
         *
         * Note: default value of 'self' flag is false.
         */

        'font-src' => [
            //
        ],

        'connect-src' => [
            //
        ],

        'form-action' => [
            //
        ],

        'frame-ancestors' => [
            //
        ],

        'media-src' => [
            //
        ],

        'object-src' => [
            //
        ],

        /*
         * plugin-types only support 'allow'.
         */

        'plugin-types' => [
            //
        ],
    ],
];

PHP Fatal error:  Cannot use empty array elements in arrays in C:\Web\myapp\config\secure-headers.php on line 4