[13/Oct/2019 09:51:06] "GET /choices/tickets/AllTickets/merge_to?query=1&start=0 HTTP/1.1" 500 89598

Internal Server Error: /choices/tickets/AllTickets/merge_to

Traceback (most recent call last):

 File "/home/tonis/Projects/lino/py3/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner

   response = get_response(request)

 File "/home/tonis/Projects/lino/py3/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response

   response = self.process_exception_by_middleware(e, request)

 File "/home/tonis/Projects/lino/py3/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response

   response = wrapped_callback(request, *callback_args, **callback_kwargs)

 File "/home/tonis/Projects/lino/py3/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view

   return self.dispatch(request, *args, **kwargs)

 File "/home/tonis/Projects/lino/py3/lib/python3.7/site-packages/django/views/generic/base.py", line 97, in dispatch

   return handler(request, *args, **kwargs)

 File "/home/tonis/Projects/lino/src/react/lino_react/react/views.py", line 512, in get

   if field.blank:

AttributeError: 'NoneType' object has no attribute 'blank'