Running wizard issue

[albosta]

Odoo Server Error
Traceback (most recent call last):
File "/odoo/odoo-server/odoo/http.py", line 654, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/odoo/odoo-server/odoo/http.py", line 312, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/odoo/odoo-server/odoo/tools/pycompat.py", line 87, in reraise
raise value
File "/odoo/odoo-server/odoo/http.py", line 696, in dispatch
result = self._call_function(**self.params)
File "/odoo/odoo-server/odoo/http.py", line 344, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/odoo/odoo-server/odoo/service/model.py", line 97, in wrapper
return f(dbname, *args, **kwargs)
File "/odoo/odoo-server/odoo/http.py", line 337, in checked_call
result = self.endpoint(*a, **kw)
File "/odoo/odoo-server/odoo/http.py", line 939, in call
return self.method(*args, **kw)
File "/odoo/odoo-server/odoo/http.py", line 517, in response_wrap
response = f(*args, **kw)
File "/odoo/odoo-server/addons/web/controllers/main.py", line 966, in call_button
action = self._call_kw(model, method, args, {})
File "/odoo/odoo-server/addons/web/controllers/main.py", line 954, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/odoo/odoo-server/odoo/api.py", line 749, in call_kw
return _call_kw_multi(method, model, args, kwargs)
File "/odoo/odoo-server/odoo/api.py", line 736, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/odoo/odoo-server/addons/hr_pyzk/wizard/user_wizard.py", line 22, in import_users
unique_data = c.DeviceUsers.get_users(devices)
File "/odoo/odoo-server/addons/hr_pyzk/controllers/controller.py", line 25, in get_users
return unique_data
UnboundLocalError: local variable 'unique_data' referenced before assignment