gistfile1.txt

socket.on('update-pos', function(data) {
  if(allMonsters[data.id] == undefined) {
    allMonsters[data.id] = new Monster(data.x, data.y, data.type, data.id, data.direction);
  }
  else {
    // Relevant part, by getting to this point we assume the human 
    // does in fact exist, as it's in the list of human ID's
    posUpdates.push(data);
  }
});



Game.update = function() {

...

  posUpdates.forEach(function(element, index, array) {
    var theMonster = allMonsters[element.id];
    // Due to the previous test, we assumed that the monster here exists, 
    // however it disconnected before this function had an opritunuty to run and it's now undefined 
    // this causes and error and the client to fail 
    theMonster.x = element.x;
    theMonster.y = element.y;
    theMonster.animations.currentAnimation = 'move';
    theMonster.direction = element.direction;
  });
  
}