MultiValueDictKeyError Issue when using with Streamfields

[JaredOzzy]

I am getting a strange issue when i am using the condensed inline panel with a orderable that has a field that is used as a streamfield. Everything works until i try to post(save the page with new items), if i use the Normal InlinePanal it works, if i convert back to condensed inlinepanel it also works, until i add an item again.
Im using:

wagtail>=2.1,<2.2
wagtail-condensedinlinepanel==0.5.2

models

class DownloadDocPage(Page):
    content_panels = Page.content_panels + [
        MultiFieldPanel(
            [
                CondensedInlinePanel('operating_systems'),
            ],
            heading="Operating Systems",
            classname="collapsible"
        ),
        MultiFieldPanel(
            [
                CondensedInlinePanel('apis'),
            ],
            heading="Application Programming Interfaces",
            classname="collapsible"
        ),
    ]
    parent_page_types = ['HomePage']

class OperatingSystems(Orderable):
    page = ParentalKey(DownloadDocPage, related_name='operating_systems')
    operating_system = models.CharField(max_length=255)
    characterless_id = models.CharField(max_length=30, help_text='This should be a unique lower-case ID with no special characters, for example Unix-Like would be unixlike')
    text = StreamField(blocks.TextStreamBlock())

    panels = [
        FieldPanel('operating_system'),
        FieldPanel('characterless_id'),
        StreamFieldPanel('text'),
    ]

    def __str__(self):
        return u'{}'.format(self.operating_system)

blocks.py

class TextStreamBlock(StreamBlock):
    richtext = RichTextBlock()
    text = TextBlock()

traceback

Environment:


Request Method: POST
Request URL: http://localhost/cms/pages/56/edit/

Django Version: 1.11.20
Python Version: 3.6.8
Installed Applications:
['django.contrib.admin',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.sites',
 'django_countries',
 'user',
 'app',
 'pipeline',
 'minio_storage',
 'modelcluster',
 'taggit',
 'honeypot',
 'djcelery_email',
 'heartbeat',
 'constance.backends.database',
 'django.contrib.auth',
 'wagtail.contrib.modeladmin',
 'wagtail.contrib.forms',
 'wagtail.contrib.redirects',
 'wagtail.embeds',
 'wagtail.sites',
 'wagtail.users',
 'wagtail.snippets',
 'wagtail.documents',
 'wagtail.images',
 'wagtail.search',
 'wagtail.admin',
 'wagtail.core',
 'wagtailfontawesome',
 'condensedinlinepanel',
 'allauth',
 'allauth.account',
 'allauth.socialaccount']
Installed Middleware:
['django.middleware.cache.UpdateCacheMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'htmlmin.middleware.HtmlMinifyMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'wagtail.core.middleware.SiteMiddleware',
 'wagtail.contrib.redirects.middleware.RedirectMiddleware',
 'django.middleware.cache.FetchFromCacheMiddleware',
 'htmlmin.middleware.MarkRequestMiddleware']



Traceback:

File "/usr/local/lib/python3.6/site-packages/django/utils/datastructures.py" in __getitem__
  83.             list_ = super(MultiValueDict, self).__getitem__(key)

During handling of the above exception ('operating_systems-0-text-count'), another exception occurred:

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.6/site-packages/django/views/decorators/cache.py" in _cache_controlled
  43.             response = viewfunc(request, *args, **kw)

File "/usr/local/lib/python3.6/site-packages/wagtail/admin/urls/__init__.py" in wrapper
  102.             return view_func(request, *args, **kwargs)

File "/usr/local/lib/python3.6/site-packages/wagtail/admin/decorators.py" in decorated_view
  34.             return view_func(request, *args, **kwargs)

File "/usr/local/lib/python3.6/site-packages/wagtail/admin/views/pages.py" in edit
  339.         if form.is_valid() and not page.locked:

File "/usr/local/lib/python3.6/site-packages/modelcluster/forms.py" in is_valid
  309.         formsets_are_valid = all([formset.is_valid() for formset in self.formsets.values()])

File "/usr/local/lib/python3.6/site-packages/modelcluster/forms.py" in <listcomp>
  309.         formsets_are_valid = all([formset.is_valid() for formset in self.formsets.values()])

File "/usr/local/lib/python3.6/site-packages/django/forms/formsets.py" in is_valid
  321.         self.errors

File "/usr/local/lib/python3.6/site-packages/django/forms/formsets.py" in errors
  295.             self.full_clean()

File "/usr/local/lib/python3.6/site-packages/django/forms/formsets.py" in full_clean
  346.             if not form.has_changed() and i >= self.initial_form_count():

File "/usr/local/lib/python3.6/site-packages/django/forms/forms.py" in has_changed
  439.         return bool(self.changed_data)

File "/usr/local/lib/python3.6/site-packages/django/utils/functional.py" in __get__
  35.         res = instance.__dict__[self.name] = self.func(instance)

File "/usr/local/lib/python3.6/site-packages/django/forms/forms.py" in changed_data
  446.             data_value = field.widget.value_from_datadict(self.data, self.files, prefixed_name)

File "/usr/local/lib/python3.6/site-packages/wagtail/core/blocks/base.py" in value_from_datadict
  512.         return self.block_def.value_from_datadict(data, files, name)

File "/usr/local/lib/python3.6/site-packages/wagtail/core/blocks/stream_block.py" in value_from_datadict
  152.         count = int(data['%s-count' % prefix])

File "/usr/local/lib/python3.6/site-packages/django/utils/datastructures.py" in __getitem__
  85.             raise MultiValueDictKeyError(repr(key))

Exception Type: MultiValueDictKeyError at /cms/pages/56/edit/
Exception Value: "'operating_systems-0-text-count'"
```
`

[abadez]

I'm having the same problem

[JaredOzzy]

@abadez

I believe i stopped using the condensedInlinePanel because of this issue, there wasn't a workaround for me.

[crukundo]

What's the status on this?