Error running ansible-cmdb - 'unicode' object has no attribute 'extend'

[franko108]

Hello,
I'm trying to run ansible-cmdb.
The collecting of the facts is successful with command:
$ ansible -i hosts -m setup --tree out/ all
and there are created json files.
When I run ansible-cmdb, here is the error:

$ ansible-cmdb --debug out/ > out/overview.html
Reading host vars from host_vars/automatisierung-db
Traceback (most recent call last):
  File "/usr/local/bin/../lib/ansiblecmdb/ansible-cmdb.py", line 205, in <module>
    limit=options.limit, debug=options.debug)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 61, in __init__
    self._parse_hostvar_dir(inventory_path)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 182, in _parse_hostvar_dir
    self._parse_hostvar_file(hostname, full_path)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 222, in _parse_hostvar_file
    self.update_host(hostname, {'hostvars': invars}, overwrite=True)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 338, in update_host
    util.deepupdate(host_info, key_values, overwrite=overwrite)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/util.py", line 37, in deepupdate
    deepupdate(target[k], v, overwrite=overwrite)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/util.py", line 32, in deepupdate
    target[k].extend(v)

Without debug, this is the output:

$ ansible-cmdb  out/ > out/overview.html
Traceback (most recent call last):
  File "/usr/local/bin/../lib/ansiblecmdb/ansible-cmdb.py", line 205, in <module>
    limit=options.limit, debug=options.debug)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 61, in __init__
    self._parse_hostvar_dir(inventory_path)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 182, in _parse_hostvar_dir
    self._parse_hostvar_file(hostname, full_path)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 222, in _parse_hostvar_file
    self.update_host(hostname, {'hostvars': invars}, overwrite=True)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/ansible.py", line 338, in update_host
    util.deepupdate(host_info, key_values, overwrite=overwrite)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/util.py", line 37, in deepupdate
    deepupdate(target[k], v, overwrite=overwrite)
  File "/usr/local/lib/python2.7/dist-packages/ansiblecmdb/util.py", line 32, in deepupdate
    target[k].extend(v)
AttributeError: 'unicode' object has no attribute 'extend'

• Python version is 2.7.15+
• Ubuntu 18.04.3 LTS

I tried to remove some potential unicode charachters like:
Debian\x209.8.0\x20amd64\x20n , it didn't help.
Thanks in a advance.
Here is json example output:

ade-dc-01.txt