Making an array with a spot for every client - NodeJs

  private tradeID: {
    [guid: string]: number
  };
  private spamWaited: {
    [guid: string]: number
  };
  private theirslots: {
    [guid: string]: boolean[]
  };
  constructor () {
    this.tradeID = {};
    this.spamWaited = {};
    this.theirslots = {};
    Client.on('connect', (pd, client: Client) => {
      this.tradeID[client.alias] = 0;
      this.spamWaited[client.alias] = 0;
      //set the lenght of the arrays to 12 and fill with false.
      this.theirslots[client.alias].length = 12;
      this.theirslots[client.alias].fill(false);
    });
  }

[09:27:10 | PluginManager]    Error while calling NEWTICK hook on TradebotReborn
[09:27:10 | PluginManager]    TypeError: Cannot set property 'SHENDYT' of undefined