overviewer marker error

grzesiek11@starypc:~/servers/mc$ overviewer --skip-scan --genpoi -c markers.conf
2019-07-22 11:23:37  Initialized an empty UUID cache.
2019-07-22 11:23:37 E An error has occurred. This may be a bug. Please let us know!
See http://docs.overviewer.org/en/latest/index.html#help

This is the error that occurred:
Traceback (most recent call last):
  File "/home/grzesiek11/Programy/path/overviewer", line 650, in <module>
    ret = main()
  File "/home/grzesiek11/Programy/path/overviewer", line 168, in main
    g.genPOI.main()
  File "/home/grzesiek11/Programy/overviewer/overviewer_core/aux_files/genPOI.py", line 557, in main
    handlePlayers(worldpath, list(worldpath_filters), markers)
  File "/home/grzesiek11/Programy/overviewer/overviewer_core/aux_files/genPOI.py", line 361, in handlePlayers
    result = filter_function(data)
  File "markers.conf", line 7, in placeFilter
    return poi['name']
  File "/home/grzesiek11/Programy/overviewer/overviewer_core/aux_files/genPOI.py", line 270, in __getitem__
    return super(PlayerDict, self).__getitem__(item)
KeyError: 'name'
grzesiek11@starypc:~/servers/mc$ cd
grzesiek11@starypc:~$ cat ~/servers/mc/markers.conf
def playerIcons(poi):
    if poi['id'] == 'Player':
        poi['icon'] = "https://overviewer.org/avatar/%s" % poi['EntityId']
        return "Last known location for %s" % poi['EntityId']

def placeFilter(poi):
    return poi['name']

worlds["survival"] = "/home/grzesiek11/servers/mc/world"
outputdir = "/var/www/html/server/mcmap-test"

renders['survivalday'] = {
    'world': 'survival',
    'title': 'Survival Daytime',
    'manualpois': [
                    {'id':'Base',
                    'x':200,
                    'y':64,
                    'z':200,
                    'name':'Foo'},
                    {'id':'Base',
                    'x':-300,
                    'y':85,
                    'z':-234,
                    'name':'Bar'}],
    'markers': [dict(name="Bases", filterFunction=placeFilter),
        dict(name="Players", filterFunction=playerIcons)]
}

renders['survivalnight'] = {
    'world': 'survival',
    'title': 'Survival Nighttime',
    'manualpois': renders['survivalday']['manualpois'],
    'markers': renders['survivalday']['markers']
}

renders['survivalnether'] = {
    'world': 'survival',
    'title': 'Survival Nether',
    'manualpois': [
                    {'id':'Portal',
                    'x':200,
                    'y':64,
                    'z':200,
                    'name':'Foo'},
                    {'id':'Portal',
                    'x':-300,
                    'y':85,
                    'z':-234,
                    'name':'Bar'}],
    'markers': [dict(name="Portals", filterFunction=placeFilter),
        dict(name="Players", filterFunction=playerIcons)]
}
grzesiek11@starypc:~$