laravel-mix production build failed

I have an issue with the production build of my app, the dev build is working fine, but when I run the production build it fails with the following error

cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --config=node_modules/laravel-mix/setup/webpack.config.js

CssSyntaxError: /css/app.css:39524:3: Unknown word
    at Input.error (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/input.js:128:16)
    at Parser.unknownWord (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/parser.js:561:22)
    at Parser.decl (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/parser.js:233:16)
    at Parser.other (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/parser.js:164:12)
    at Parser.parse (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/parser.js:75:16)
    at parse (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/parse.js:17:12)
    at new LazyResult (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/lazy-result.js:64:16)
    at Processor.<anonymous> (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/processor.js:142:12)
    at Processor.process (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/processor.js:121:23)
    at Function.creator.process (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/postcss/lib/postcss.js:148:43)
    at OptimizeCssAssetsWebpackPlugin.processCss (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/optimize-css-assets-webpack-plugin/src/index.js:73:21)
    at Object.processor (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/optimize-css-assets-webpack-plugin/src/index.js:13:18)
    at /Users/vladimirgatev/Sites/localhost/SP6/node_modules/last-call-webpack-plugin/src/index.js:150:10
    at arrayEach (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/lodash/_arrayEach.js:15:9)
    at forEach (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/lodash/forEach.js:38:10)
    at OptimizeCssAssetsWebpackPlugin.process (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/last-call-webpack-plugin/src/index.js:147:5)
    at /Users/vladimirgatev/Sites/localhost/SP6/node_modules/last-call-webpack-plugin/src/index.js:178:28
    at _next0 (eval at create (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:9:17)
    at eval (eval at create (/Users/vladimirgatev/Sites/localhost/SP6/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:27:1)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)

I noticed that there is a javascript at the end of the app.css

/* (ignored) *//* (ignored) *//* (ignored) *//* (ignored) *//* (ignored) *//* (ignored) */var map = {
    "./Products": [
        "./frontend/src/views/apps/orders/orders-add/templates/Products.vue",
        2,
        9,
        17
    ],
    "./Products.vue": [
        "./frontend/src/views/apps/orders/orders-add/templates/Products.vue",
        2,
        9,
        17
    ],
    "./Shops": [
        "./frontend/src/views/apps/orders/orders-add/templates/Shops.vue",
        7
    ],
    "./Shops.vue": [
        "./frontend/src/views/apps/orders/orders-add/templates/Shops.vue",
        7
    ],
    "./Stage": [
        "./frontend/src/views/apps/orders/orders-add/templates/Stage.vue",
        2,
        4,
        3,
        5,
        10,
        16
    ],
    "./Stage.vue": [
        "./frontend/src/views/apps/orders/orders-add/templates/Stage.vue",
        2,
        4,
        3,
        5,
        10,
        16
    ]
};
function webpackAsyncContext(req) {
    if(!__webpack_require__.o(map, req)) {
        return Promise.resolve().then(function() {
            var e = new Error("Cannot find module '" + req + "'");
            e.code = 'MODULE_NOT_FOUND';
            throw e;
        });
    }

    var ids = map[req], id = ids[0];
    return Promise.all(ids.slice(1).map(__webpack_require__.e)).then(function() {
        return __webpack_require__(id);
    });
}
webpackAsyncContext.keys = function webpackAsyncContextKeys() {
    return Object.keys(map);
};
webpackAsyncContext.id = "./frontend/src/views/apps/orders/orders-add/templates lazy recursive ^\.\/.*$";
module.exports = webpackAsyncContext;

I think it is something related to dynamic imports of modules, but I do not know how to fix that.

laravel-mix version 5.0.1
webpack version: 4.46.0