Cannot set property 'className' of undefined

Uncaught TypeError: Cannot set property 'className' of undefined
    at refreshDiv (game.js:56)
    at Game.init (game.js:73)
    at Local.start (local.js:11)
    at script.js:2

    var refreshDiv = function(data,divs){  
        for(var i=0; i<data.length; i++){
            for(var j=0; j<data[0].length; j++){ 
                if(data[i][j] == 0){
                    divs[i][j].className = "none";
                } else if(data[i][j] == 1){
                    divs[i][j].className = "none";
                } else if(data[i][j] == 2){
                    divs[i][j].className = "none";
                }
            }
        }
    }