When setting new language and restart in continous mode it gives error about artyom.js HOT 3 CLOSED

/**
 * Note that this commands will work only in english mode .. in other language they will be not so good 
 * recognized.
 */ 
artyom.addCommands({
    // note that if you're in spanish for example
    // the command should be instead : "Iniciar en ingles, Iniciar en alemán" etc...
    indexes:["switch to italian","switch to german",
             "switch to french","switch to spanish",
             "switch to portuguese","switch to dutch",
             "switch to polish","switch to indonesian",
             "switch to english"],
    action: function(i){
        switch(i){
            case 0: stop(); start("it-IT"); break;
            case 1: start("de-IT"); break;
            case 2: start("fr-FR"); break;
            case 3: start("es-ES"); break;
            case 4: start("pt-PT"); break;
            case 5: start("nl-NL"); break;
            case 6: start("pl-PL"); break;
            case 7: start("id-ID"); break;
            case 8: start("en-GB"); break;
        }
    }
});

// on command recognition end
artyom.when("COMMAND_RECOGNITION_END",function(status){
    if(status.code == "continuous_mode_enabled"){
        console.info("Command reconition finalized, restarting because the continuous mode is enabled");
    }
});

function start(language){
    if(!language){
        language = artyom.getLanguage(); 
    }

    var _startArtyom = function(){
        artyom.initialize({
            lang: language,// Start artyom with provided language
            continuous:true,// Continuous mode enabled
            listen:true, // Start recognizing
            debug:true, // Show everything in the console
            speed:1, // talk normally
            executionKeyword: "now" // say "now" at the end of a command to execute it immediately
        });

        console.log("Artyom is listening to your commands");
    };

    // stop artyom if stills active
    artyom.fatality();
    setTimeout(_startArtyom,250);
}

// Catch errors
artyom.when("ERROR",function(data){
    console.error(data);
});

start("en-GB");
// or 
// start("en-US");