Nesting For Loops -- Length Undefined

Tell us what’s happening:
I’m getting Cannot read property ‘length’ of undefined, but I’m not sure why.

Your code so far

function multiplyAll(arr) {
  var product = 1;
  // Only change code below this line

 for (var i=0; arr.length; i++){
   for(var j=0; j <arr[i].length; j++){

  // Only change code above this line
  return product;

// Modify values below to test your code

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36.

Link to the challenge:

 for (var i=0; arr.length; i++){

You did not create this for loop correctly.

I see that. I had been messing around with the code and must have deleted that my mistake. Fixed, but still having issues

What is your current code? How is it failing?