Runtime error is triggered since Judge is expecting an array of arguments. Use console.log command in your submit to see the kind of input your program is receiving.

Still your code gives only 90%. Check out this earlier forum-discussion to find out where the last 10% are =>

https://softuni.bg/forum/28839/9-2-passion-days-zadachi-za-shampioni-javascript

;-)

Refactored code (90/100):

// function passionDays(shoppingMoney, commands) {
function passionDays(commands) {
    shoppingMoney = Number(commands[0]);
    let i = 1;
    let purchases = 0;
    let command = commands[i];

    while (command !== 'mall.Enter') {
        i++;
        command = commands[i];
    }
    
    command = commands[++i];

    while (command !== 'mall.Exit') {
        for (let j = 0; j < command.length; j++) {
            const action = command[j];

            if (action >= 'A' && action <= 'Z') {
                let price = action.charCodeAt() * 0.5;

                if (shoppingMoney < price) {
                    continue;
                }

                shoppingMoney -= price;
                purchases++;

            } else if (action >= 'a' && action <= 'z') {
                let price = action.charCodeAt() * 0.3;

                if (shoppingMoney < price) {
                    continue;
                }

                shoppingMoney -= price;
                purchases++;

            } else if (action == '%') {
                if (shoppingMoney > 0) {
                    shoppingMoney /= 2;
                    purchases++;
                }

            } else if (action == '*') {
                shoppingMoney += 10;

            } else {
                let price = action.charCodeAt();

                if (shoppingMoney < price) {
                    continue;
                }

                shoppingMoney -= price;
                purchases++;
            }
        }

        i++;
        command = commands[i];
    }

    if (purchases === 0) {
        console.log(`No purchases. Money left: ${shoppingMoney.toFixed(2)} lv.`);
    } else {
        console.log(`${purchases} purchases. Money left: ${shoppingMoney.toFixed(2)} lv.`);
    }
}