Hmm, couple of problems and code-logic was not fully implemented. I have revised your solution but do analyse the changes that were implemented. The break error came from the following line, since you used break statement ouside of the while-loop:

    if (current == "End") {
        console.log(`Failed to collect required money for charity.`)
        break;
    }

Best,

function reportSystem(arr) {
    let neededMoney = Number(arr[0]);
    let action = 0;
    let cashSum = 0;
    let transActionSum = 0;
    let sum = 0;
    let peopleCash = 0;
    let peopleTransaction = 0;

    let index = 1;
    let current = arr[index];

    // while (current !== "End") {
    while (index < arr.length) {
        if (current === "End") {
            console.log(`Failed to collect required money for charity.`)
            break;
        }

        action += 1;

        current = Number(arr[index]);

        if (action % 2 !== 0) {
            if (current > 100) {
                console.log(`Error in transaction!`);
            } else {
                console.log(`Product sold!`)
                cashSum += current;
                // sum += cashSum;
                sum += current;
                peopleCash += 1;
            }
        } else {
            if (current < 10) {
                console.log(`Error in transaction!`);
            } else {
                console.log(`Product sold!`)
                transActionSum += current;
                // sum += transActionSum;
                sum += current;
                peopleTransaction += 1;
            }
        }
        if (sum >= neededMoney) {
            console.log(`Average CS: ${(cashSum / peopleCash).toFixed(2)}`);
            console.log(`Average CC: ${(transActionSum / peopleTransaction).toFixed(2)}`);
            break;
        }
        index++;
        current = arr[index];
    }

    // if (current == "End") {
    //     console.log(`Failed to collect required money for charity.`)
    //     break;
    // }

    // console.log(`Average CS: ${(cashSum / peopleCash).toFixed(2)}`);
    // console.log(`Average CC: ${(transActionSum / peopleTransaction).toFixed(2)}`);
}