Seemingly random POST bug

[Duchadian]

Error occurred during annotation of an item with a larger span, where the first item was selected twice.
Example:
zo zeer -> zozeer , where part 'zo' was selected twice.

Editor submission failed: HTTPError at /merged_annotations/page1144.tested.tagged/query/
HTTP Error 404: Not Found

Request Method: POST
Request URL: https://flat.science.ru.nl/merged_annotations/page1144.tested.tagged/query/
Django Version: 2.0
Python Executable: /usr/bin/uwsgi
Python Version: 3.5.2
Python Path: ['.', '', '/var/www/lamachine/lib/python35.zip', '/var/www/lamachine/lib/python3.5', '/var/www/lamachine/lib/python3.5/plat-x86_64-linux-gnu', '/var/www/lamachine/lib/python3.5/lib-dynload', '/usr/lib/python3.5', '/usr/lib/python3.5/plat-x86_64-linux-gnu', '/var/www/lamachine/lib/python3.5/site-packages', '/var/www/lamachine/lib/python3.5/site-packages/LuigiNLP-0.3-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/sciluigi-0.9.5b6-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/natsort-5.1.0-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/luigi-2.6.2-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/python_daemon-2.1.2-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/tornado-4.5.1-py3.5-linux-x86_64.egg', '/var/www/lamachine/lib/python3.5/site-packages/lockfile-0.12.2-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/python_Levenshtein-0.12.0-py3.5-linux-x86_64.egg', '/var/www/lamachine/lib/python3.5/site-packages/PICCL-0.4-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/alex_asr-1.0.4-py3.5-linux-x86_64.egg', '/var/www/lamachine/lib/python3.5/site-packages/pystache-0.5.4-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/Gecco-0.2.3-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/FoLiA_tools-1.5.0.57-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/foliadocserve-0.6.4-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/CLAM-2.2.2-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/CLAMServices-1.4.4-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages', '/var/www/lamachine/lib/python3.5/site-packages/sciluigi-0.9.5b6-py3.5.egg', '/var/www/lamachine/lib/python3.5/site-packages/natsort-5.1.0-py3.5.egg', '/var/www/flat/etc/']
Server time: Mon, 8 Jan 2018 11:49:41 +0100
Installed Applications:
('django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.admin',
'flat.users',
'flat.modes.viewer',
'flat.modes.editor',
'flat.modes.structureeditor',
'flat.modes.metadata')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware')

Traceback:

File "/var/www/lamachine/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)

File "/var/www/lamachine/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)

File "/var/www/lamachine/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/var/www/lamachine/lib/python3.5/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
21. return view_func(request, *args, **kwargs)

File "/var/www/lamachine/lib/python3.5/site-packages/flat/views.py" in query
234. return query_helper(request, namespace,docid, request.session['configuration'])

File "/var/www/lamachine/lib/python3.5/site-packages/flat/views.py" in query_helper
223. return HttpResponseForbidden("FoLiA Document Server error: " + docserveerror(e)['fatalerror_text'])

File "/var/www/lamachine/lib/python3.5/site-packages/flat/views.py" in docserveerror
94. raise e

File "/var/www/lamachine/lib/python3.5/site-packages/flat/views.py" in query_helper
217. d = flat.comm.query(request, query,**flatargs)

File "/var/www/lamachine/lib/python3.5/site-packages/flat/comm.py" in query
58. f = urlopen(docservereq,urlencode(data).encode('utf-8')) #or opener.open()

File "/usr/lib/python3.5/urllib/request.py" in urlopen
163. return opener.open(url, data, timeout)

File "/usr/lib/python3.5/urllib/request.py" in open
472. response = meth(req, response)

File "/usr/lib/python3.5/urllib/request.py" in http_response
582. 'http', request, response, code, msg, hdrs)

File "/usr/lib/python3.5/urllib/request.py" in error
510. return self._call_chain(*args)

File "/usr/lib/python3.5/urllib/request.py" in _call_chain
444. result = func(*args)

File "/usr/lib/python3.5/urllib/request.py" in http_error_default
590. raise HTTPError(req.full_url, code, msg, hdrs, fp)

Exception Type: HTTPError at /merged_annotations/page1144.tested.tagged/query/
Exception Value: HTTP Error 404: Not Found
Request information:
USER: duchs

GET: No GET data

POST: No POST data

FILES: No FILES data

COOKIES:
csrftoken = 'EHoVZKkzKNc1oiE2XXHz8Boovs0CCSu9zNZCaEs6rd6oHWLtcGidUO7G2npHhNqc'
sessionid = 'a8pp39xos7z3hthw3st90opcdzp6p1e7'
__lc.visitor_id.1038190 = 'S1511187429.37d8051d8b'

META:
CONTENT_LENGTH = '502'
CONTENT_TYPE = 'application/json'
CONTEXT_DOCUMENT_ROOT = '/var/www/html'
CONTEXT_PREFIX = ''
CSRF_COOKIE = 'EHoVZKkzKNc1oiE2XXHz8Boovs0CCSu9zNZCaEs6rd6oHWLtcGidUO7G2npHhNqc'
DOCUMENT_ROOT = '/var/www/html'
GATEWAY_INTERFACE = 'CGI/1.1'
HTTPS = 'on'
HTTP_ACCEPT = 'application/json, text/javascript, /; q=0.01'
HTTP_ACCEPT_ENCODING = 'gzip, deflate, br'
HTTP_ACCEPT_LANGUAGE = 'en-US,en;q=0.5'
HTTP_CONNECTION = 'keep-alive'
HTTP_COOKIE = '__lc.visitor_id.1038190=S1511187429.37d8051d8b; csrftoken=EHoVZKkzKNc1oiE2XXHz8Boovs0CCSu9zNZCaEs6rd6oHWLtcGidUO7G2npHhNqc; sessionid=a8pp39xos7z3hthw3st90opcdzp6p1e7'
HTTP_DNT = '1'
HTTP_HOST = 'flat.science.ru.nl'
HTTP_REFERER = 'https://flat.science.ru.nl/editor/merged_annotations/page1144.tested.tagged/'
HTTP_USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0'
HTTP_X_CSRFTOKEN = 'EHoVZKkzKNc1oiE2XXHz8Boovs0CCSu9zNZCaEs6rd6oHWLtcGidUO7G2npHhNqc'
HTTP_X_REQUESTED_WITH = 'XMLHttpRequest'
HTTP_X_SESSIONID = '959523110'
PATH = '/usr/local/bin:/usr/bin:/bin'
PATH_INFO = '/merged_annotations/page1144.tested.tagged/query/'
QUERY_STRING = ''
REMOTE_ADDR = '145.102.26.243'
REMOTE_PORT = '50884'
REQUEST_METHOD = 'POST'
REQUEST_SCHEME = 'https'
REQUEST_URI = '/merged_annotations/page1144.tested.tagged/query/'
SCRIPT_FILENAME = 'proxy:uwsgi://127.0.0.1:8213/merged_annotations/page1144.tested.tagged/query/'
SCRIPT_NAME = ''
SERVER_ADDR = '131.174.114.206'
SERVER_ADMIN = '[no address given]'
SERVER_NAME = 'flat.science.ru.nl'
SERVER_PORT = '443'
SERVER_PROTOCOL = 'HTTP/1.1'
SERVER_SIGNATURE = '

Apache/2.4.18 (Ubuntu) Server at flat.science.ru.nl Port 443\n'
SERVER_SOFTWARE = 'Apache/2.4.18 (Ubuntu)'
SSL_TLS_SNI = 'flat.science.ru.nl'
uwsgi.node = b'mlp01'
uwsgi.version = b'2.0.12-debian'
wsgi.errors = <_io.TextIOWrapper name=2 mode='w' encoding='UTF-8'>
wsgi.file_wrapper = ''
wsgi.input = <uwsgi._Input object at 0x7ff9b4b259d8>
wsgi.multiprocess = False
wsgi.multithread = False
wsgi.run_once = False
wsgi.url_scheme = 'https'
wsgi.version = '(1, 0)'

Settings:
Using settings module rusettings
ABSOLUTE_URL_OVERRIDES = {}
ADMINS = "(('Maarten van Gompel', 'proycon@anaproy.nl'),)"
ALLOWED_HOSTS = ['localhost', 'flat.science.ru.nl', 'new.flat.science.ru.nl', 'applejack.science.ru.nl', 'spitfire', 'applejack', 'mlp01', '127.0.0.1']
ALLOWPUBLICUPLOAD = True
ALLOWREGISTRATION = True
APPEND_SLASH = True
AUTHENTICATION_BACKENDS = ['django.contrib.auth.backends.ModelBackend']
AUTH_PASSWORD_VALIDATORS = ''
AUTH_USER_MODEL = 'auth.User'
BASE_DIR = '/var/www/lamachine/lib/python3.5/site-packages/flat/'
CACHES = {'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}}
CACHE_MIDDLEWARE_ALIAS = 'default'
CACHE_MIDDLEWARE_KEY_PREFIX = ''
CACHE_MIDDLEWARE_SECONDS = 600
CONFIGURATIONS = {'sinfex': {'allowdeclare': False, 'annotationfocustype': 'entity', 'initialeditannotations': ('entity/https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml',), 'allowededitannotations': ('entity/https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml',), 'initialglobviewannotations': ('entity/https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml',), 'allowaddfields': False, 'editformnew': True, 'editformalternative': False, 'allowedannotationfocus': ('entity/https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml',), 'alloweditformalternative': False, 'allowedviewannotations': ('t', 'entity/https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml'), 'editformcorrection': False, 'alloweditformnew': True, 'alloweditformcorrection': False, 'annotationfocusset': 'https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml', 'allowupload': True, 'initialviewannotations': ('t', 'entity/https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml'), 'name': 'Sinfex Annotation Task', 'modes': [('editor', 'Annotation Editor')], 'autodeclare': [('entity', 'https://github.com/ahurriyetoglu/sinfexfolia/raw/master/sinfex-entities.foliaset.xml')], 'alloweditformdirect': True, 'slices': 'event:200', 'perspectives': ['event'], 'editformdirect': True}, 'parsemedemo': {'allowdeclare': False, 'requiredeclaration': [('entity', 'https://github.com/proycon/parseme-support/raw/master/parseme-mwe.foliaset.xml')], 'initialeditannotations': ('entity/https://github.com/proycon/parseme-support/raw/master/parseme-mwe.foliaset.xml',), 'editformcorrection': False, 'allowededita