slave doesn't start with PG_INIT=false

[scorpp]

docker run --rm --name postgresql-slave -e PG_DEPLOYMENT_TYPE=replicated -e PG_ROLE=slave -e PG_INIT=False -e PG_WAL_LEVEL=hot_standby -e PG_MASTER_HOST=192.168.122.55 -p 5432:5432/tcp bettervoice/postgresql-container:9.3
 * Starting PostgreSQL 9.3 database server
   ...done.
Traceback (most recent call last):
  File "/usr/bin/start-postgres", line 162, in <module>
    run('heartbeat')
  File "/usr/bin/start-postgres", line 133, in run
    check_call([app] + list(args))
  File "/usr/lib/python2.7/subprocess.py", line 535, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 522, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

heartbeat script is only written when initialize var is true