I have the same problem reported by @hasokeyk.
When trying to create new SSL certificates, looking at the log, the error follows:
[2019-07-30 18: 55: 40,588] ERROR in app: Exception on / site [POST]
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 2446, in wsgi_app
response = self.full_dispatch_request ()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1951, in full_dispatch_request
rv = self.handle_user_exception (e)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1820, in handle_user_exception
reraise (exc_type, exc_value, tb)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request ()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1935, in dispatch_request
return self.view_functions [rule.endpoint] (** req.view_args)
File "/www/server/panel/BTPanel/init.py", line 203, in site
return publicObject (siteObject, defs, None, pdata);
File "/www/server/panel/BTPanel/init.py", line 954, in publicObject
return public.GetJson (eval (fun)), json_header
File "<string>", line 1, in <module>
File "/www/server/panel/class/panelSite.py", line 867, in CreateLet
get.id = data ['id']
KeyError: 'id'