Admin menu: searching bug comments raises FieldError (may occur for other searches as well)

I was looking through the BugComments in the admin menu and tried to search but got a FieldError. Below is the traceback:

Environment:


Request Method: GET
Request URL: <redacted>/admin/CIResults/bugcomment/?q=6043

Django Version: 2.2.5
Python Version: 3.7.5
Installed Applications:
['CIResults.apps.CiresultsConfig',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.humanize',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'rest_framework',
 'django_filters',
 'django.contrib.sites',
 'allauth',
 'allauth.account',
 'allauth.socialaccount',
 'allauth.socialaccount.providers.github',
 'allauth.socialaccount.providers.gitlab',
 'django.contrib.admindocs',
 'debug_toolbar',
 'django_extensions']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'debug_toolbar.middleware.DebugToolbarMiddleware']



Traceback:

File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py" in wrapper
  606.                 return self.admin_site.admin_view(view)(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view
  142.                     response = view_func(request, *args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  44.         response = view_func(request, *args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/sites.py" in inner
  223.             return view(request, *args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapper
  45.         return bound_method(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view
  142.                     response = view_func(request, *args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py" in changelist_view
  1672.             cl = self.get_changelist_instance(request)

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py" in get_changelist_instance
  744.             sortable_by,

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/views/main.py" in __init__
  81.         self.queryset = self.get_queryset(request)

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/views/main.py" in get_queryset
  439.         qs, search_use_distinct = self.model_admin.get_search_results(request, qs, self.query)

File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py" in get_search_results
  1023.                 queryset = queryset.filter(reduce(operator.or_, or_queries))

File "/usr/local/lib/python3.7/site-packages/django/db/models/query.py" in filter
  892.         return self._filter_or_exclude(False, *args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/django/db/models/query.py" in _filter_or_exclude
  910.             clone.query.add_q(Q(*args, **kwargs))

File "/usr/local/lib/python3.7/site-packages/django/db/models/sql/query.py" in add_q
  1290.         clause, _ = self._add_q(q_object, self.used_aliases)

File "/usr/local/lib/python3.7/site-packages/django/db/models/sql/query.py" in _add_q
  1312.                     current_negated, allow_joins, split_subq, simple_col)

File "/usr/local/lib/python3.7/site-packages/django/db/models/sql/query.py" in _add_q
  1318.                     split_subq=split_subq, simple_col=simple_col,

File "/usr/local/lib/python3.7/site-packages/django/db/models/sql/query.py" in build_filter
  1251.         condition = self.build_lookup(lookups, col, value)

File "/usr/local/lib/python3.7/site-packages/django/db/models/sql/query.py" in build_lookup
  1107.                 raise FieldError('Related Field got invalid lookup: {}'.format(lookup_name))

Exception Type: FieldError at /cibuglog/admin/CIResults/bugcomment/
Exception Value: Related Field got invalid lookup: icontains