Can't unload an external auth like google

When disabling google service with :

enabled_external_auth_plugins:
{{ google: false}}

I’ve got :

2019-10-22 18:43:10,147 [16975] (ERROR) (flask.app): Exception on /0.1/users/bbcfc84c-66a3-4540-b87b-7fb183d4b73f/external [GET]
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/lib/python3/dist-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/lib/python3/dist-packages/flask_restful/_init_.py", line 458, in wrapper
resp = resource(*args, **kwargs)
File "/usr/lib/python3/dist-packages/flask/views.py", line 88, in view
return self.dispatch_request(*args, **kwargs)
File "/usr/lib/python3/dist-packages/flask_restful/_init_.py", line 573, in dispatch_request
resp = meth(*args, **kwargs)
File "/usr/lib/python3/dist-packages/xivo/rest_api_helpers.py", line 28, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/wazo_auth/http.py", line 76, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/xivo/auth_verifier.py", line 111, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/wazo_auth/plugins/http/external/http.py", line 31, in get
plugin_info = current_app.config['external_auth_plugin_info'][item['type']]
KeyError: 'google'