Loop through Snowflake array Discord.js

I'm looking for a way to loop through a snowflake array and pull data.

The data looks like:

  '0000000' => GuildMember {
  guild:
   Guild {
     members: [Object],
     id: '000000',
     name: 'Zombie',
     _rawVoiceStates: [Object] },
  user:
   User {
     id: '0000000',
     username: 'Orc',
  _roles: [ '0000' ],
  nickname: 'Orc',
  joinedTimestamp: 00000,
  lastMessageID: null },

  '0000000' => GuildMember {
  guild:
   Guild {
     members: [Object],
     id: '000000',
     name: 'Zombie',
     _rawVoiceStates: [Object] },
  user:
   User {
     id: '0000001',
     username: 'Orc1',
  _roles: [ '0000' ],
  nickname: 'Orc',
  joinedTimestamp: 00000,
  lastMessageID: null },
  _array: null,
  _keyArray: null }

My current loop is:

var user;
for(var u in test.members){
   user = test.members[u];
    console.log("["+u+"] "+user.username);
}

It currently kicks back a TypeError: Cannot read property 'user' of null

Any help would be helpful.

via Carl