[11.0] [muk_dms_export] certificate verify failed for iap-converter website

[spacimek]

Your muk_dms_export module is referencing https://iap-converter.mukit.at/iap/converter/1/formats

However that website:

1. Has invalid certificate (needs renewal)
2. Returns default backend - 404

I am using:
odoo11-addon-muk-web-export-11.0.1.0.7
odoo11-addon-muk-dms-export-11.0.1.0.1

This is the log:
odoo.addons.iap.models.iap: iap jsonrpc https://iap-converter.mukit.at/iap/converter/1/formats
...
Traceback (most recent call last):
File "/opt/odoo/11_envs/eh-test/lib/python3.6/site-packages/odoo/addons/muk_utils/tools/cache.py", line 46, in wrapper
value = self.cache[key]
KeyError: ((<odoo.addons.muk_converter.service.provider.RemoteConverter object at 0x7f2eadac5e80>,), ())

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/odoo/11_envs/eh-test/lib/python3.6/site-packages/urllib3/contrib/pyopenssl.py", line 438, in wrap_socket
cnx.do_handshake()
File "/opt/odoo/11_envs/eh-test/lib/python3.6/site-packages/OpenSSL/SSL.py", line 1907, in do_handshake
self._raise_ssl_error(self._ssl, result)
File "/opt/odoo/11_envs/eh-test/lib/python3.6/site-packages/OpenSSL/SSL.py", line 1639, in _raise_ssl_error
_raise_current_error()
File "/opt/odoo/11_envs/eh-test/lib/python3.6/site-packages/OpenSSL/_util.py", line 54, in exception_from_error_queue
raise exception_type(errors)
OpenSSL.SSL.Error: [('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')]

The url that this service requested returned an error. Please contact the author the app. The url it tried to contact was https://iap-converter.mukit.at/iap/converter/1/formats
None
None" while parsing /opt/odoo/11_envs/eh-test/lib/python3.6/site-packages/odoo/addons/muk_dms_export/views/dms_convert_view.xml:23, near