Cannot update existing records

[anxolerd]

STR

1. create a new entry (vacancy for example)
2. save it
3. open it for editing
4. change something
5. click save button

Expected result

Entry successfully updated

Actual result

Traceback (most recent call last):
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "/home/anxolerd/workspace/Meowth/env/lib/python3.4/site-packages/flask/views.py", line 149, in dispatch_request
    return meth(*args, **kwargs)
  File "/home/anxolerd/workspace/Meowth/project/admin/utils.py", line 63, in post
    model.bl.update(self._clean_data(form.data))
  File "/home/anxolerd/workspace/Meowth/project/admin/utils.py", line 30, in _clean_data
    for (k, v) in _data:
ValueError: too many values to unpack (expected 2)