node_redis: Deprecated: The EVALSHA command contains a "undefined" argument.

[danielckv]

Getting this each time when I'm trying to lock a specific scope with a key.

{ [ReplyError: ERR unknown command 'evalsha']
 command: 'EVALSHA',
args:
  [ undefined,
1,
'mutex:+972-526401664',
 '358b3de0-8ec8-11e6-a741-ffbd9c3ed399',
5000 ],
code: 'ERR' }

This is the declaration:

mutex.lock( phoneNumber, function( err, unlock ) { // CODE .... }