AttributeError at /packs/
'NoneType' object has no attribute 'strftime'

Request Method: GET
Request URL: https://stg.api.royalsapp.com/packs/?type=special
Django Version: 1.11.10
Python Executable: /webapps/royals/bin/python3.6
Python Version: 3.6.2
Python Path: ['/webapps/royals/royals', '/webapps/royals/bin', '/webapps/royals/lib/python36.zip', '/webapps/royals/lib/python3.6', '/webapps/royals/lib/python3.6/lib-dynload', '/usr/lib/python3.6', '/webapps/royals/lib/python3.6/site-packages', '/webapps/royals/royals']
Server time: Mon, 23 Apr 2018 13:49:32 +0200
Installed Applications:
['liststyle',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.gis',
 'rest_framework',
 'rest_framework.authtoken',
 'rest_framework_swagger',
 'rest_framework_tracking',
 'drf_yasg',
 'rangefilter',
 'django_extensions',
 'social_django',
 'itunesiap',
 'mapwidgets',
 'storages',
 'push_notifications',
 'positions',
 'django_slack',
 'users',
 'events',
 'packs',
 'brands',
 'iap',
 'matches',
 'chat',
 'notifications',
 'rankings',
 'codes',
 'common.celery_tasks',
 'analysis',
 'advertisements',
 'raven.contrib.django.raven_compat',
 'django_admin_listfilter_dropdown',
 'common.admin_list_filters',
 'common.admin_rangefilter',
 'common.textcomplete',
 'drf_multiple_model']
Installed Middleware:
['raven.contrib.django.middleware.DjangoRestFrameworkCompatMiddleware',
 'raven.contrib.django.middleware.SentryMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'social_django.middleware.SocialAuthExceptionMiddleware',
 'users.middleware.LastActivityMiddleware']


Traceback:

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

File "/webapps/royals/lib/python3.6/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

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

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

File "/webapps/royals/lib/python3.6/site-packages/django/views/decorators/csrf.py" in wrapped_view
  58.         return view_func(*args, **kwargs)

File "/webapps/royals/lib/python3.6/site-packages/django/views/generic/base.py" in view
  68.             return self.dispatch(request, *args, **kwargs)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/views.py" in dispatch
  494.             response = self.handle_exception(exc)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/views.py" in handle_exception
  454.             self.raise_uncaught_exception(exc)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/views.py" in dispatch
  491.             response = handler(request, *args, **kwargs)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/decorators.py" in handler
  53.             return func(*args, **kwargs)

File "/webapps/royals/royals/packs/views.py" in view_packs
  49.     return Response(data=serializer.data)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/serializers.py" in data
  537.         ret = super(Serializer, self).data

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/serializers.py" in data
  262.                 self._data = self.to_representation(self.instance)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/serializers.py" in to_representation
  504.                 ret[field.field_name] = field.to_representation(attribute)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/serializers.py" in to_representation
  660.             self.child.to_representation(item) for item in iterable

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/serializers.py" in <listcomp>
  660.             self.child.to_representation(item) for item in iterable

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/serializers.py" in to_representation
  504.                 ret[field.field_name] = field.to_representation(attribute)

File "/webapps/royals/lib/python3.6/site-packages/rest_framework/fields.py" in to_representation
  1816.         return method(value)

File "/webapps/royals/royals/packs/serializers.py" in get_available_until
  71.         return pack.available_until_datetime.strftime('%Y-%m-%d %H:%M:%S')

Exception Type: AttributeError at /packs/
Exception Value: 'NoneType' object has no attribute 'strftime'
Request information:
USER: Piotr Kostecki

GET:
type = 'special'

POST: No POST data

FILES: No FILES data

COOKIES: No cookie data

META:
HTTP_ACCEPT = '*/*'
HTTP_ACCEPT_ENCODING = 'gzip, deflate'
HTTP_AUTHORIZATION = 'Token f8722769e72cd6ef56a00861827f89baa16c0175'
HTTP_CACHE_CONTROL = 'no-cache'
HTTP_CONNECTION = 'close'
HTTP_HOST = 'stg.api.royalsapp.com'
HTTP_POSTMAN_TOKEN = '4554f250-267e-4f6d-a67c-64e7640ba7de'
HTTP_USER_AGENT = 'PostmanRuntime/7.1.1'
HTTP_X_FORWARDED_FOR = '109.173.155.255'
HTTP_X_FORWARDED_PROTO = 'https'
PATH_INFO = '/packs/'
QUERY_STRING = 'type=special'
RAW_URI = '/packs/?type=special'
REMOTE_ADDR = ''
REQUEST_METHOD = 'GET'
SCRIPT_NAME = ''
SERVER_NAME = 'stg.api.royalsapp.com'
SERVER_PORT = '443'
SERVER_PROTOCOL = 'HTTP/1.0'
SERVER_SOFTWARE = 'gunicorn/19.7.1'
gunicorn.socket = <socket.socket fd=11, family=AddressFamily.AF_UNIX, type=SocketKind.SOCK_STREAM, proto=0, laddr=/webapps/royals/run/gunicorn.sock>
wsgi.errors = <gunicorn.http.wsgi.WSGIErrorsWrapper object at 0x7f1e75a7f1d0>
wsgi.file_wrapper = ''
wsgi.input = <gunicorn.http.body.Body object at 0x7f1e75a7f128>
wsgi.multiprocess = True
wsgi.multithread = False
wsgi.run_once = False
wsgi.url_scheme = 'https'
wsgi.version = '(1, 0)'

Settings:
Using settings module royals.settings.staging
ABSOLUTE_URL_OVERRIDES = {}
ADMINS = []
ALLOWED_HOSTS = ['35.176.156.43', 'stg.api.royalsapp.com']
APPEND_SLASH = True
AUTHENTICATION_BACKENDS = "('social_core.backends.facebook.FacebookOAuth2', 'django.contrib.auth.backends.ModelBackend')"
AUTH_PASSWORD_VALIDATORS = '********************'
AUTH_USER_MODEL = 'users.User'
AWS_ACCESS_KEY_ID = '********************'
AWS_DEFAULT_ACL = 'private'
AWS_LOCATION = 'media'
AWS_QUERYSTRING_EXPIRE = 86400
AWS_S3_FILE_OVERWRITE = False
AWS_S3_HOST = 's3.eu-west-2.amazonaws.com'
AWS_SECRET_ACCESS_KEY = '********************'
AWS_STORAGE_BUCKET_NAME = 'royals-files'
BASE_DIR = '/webapps/royals/royals/royals'
BONUS_FOR_LEVEL_UP = [90, 90, 90, 90, 90, 90, 90, 90, 500]
BRANDS_MAX = 3
BRANDS_MIN = 0
CACHES = {'default': {'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache', 'LOCATION': '127.0.0.1:11211'}}
CACHE_MIDDLEWARE_ALIAS = 'default'
CACHE_MIDDLEWARE_KEY_PREFIX = '********************'
CACHE_MIDDLEWARE_SECONDS = 600
CELERY_ACCEPT_CONTENT = ['json']
CELERY_BROKER_URL = 'amqp://royals:b3Md6ugwHkSHDUeY44qFH4pP5g9twj8MsbLG@localhost:5672/royals'
CELERY_RESULT_BACKEND = 'amqp://royals:b3Md6ugwHkSHDUeY44qFH4pP5g9twj8MsbLG@localhost:5672/royals'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TASK_SERIALIZER = 'json'
CSRF_COOKIE_AGE = 31449600
CSRF_COOKIE_DOMAIN = None
CSRF_COOKIE_HTTPONLY = False
CSRF_COOKIE_NAME = 'csrftoken'
CSRF_COOKIE_PATH = '/'
CSRF_COOKIE_SECURE = False
CSRF_FAILURE_VIEW = 'django.views.csrf.csrf_failure'
CSRF_HEADER_NAME = 'HTTP_X_CSRFTOKEN'
CSRF_TRUSTED_ORIGINS = []
CSRF_USE_SESSIONS = False
DATABASES = {'default': {'ENGINE': 'django.contrib.gis.db.backends.postgis', 'NAME': 'royals-staging', 'USER': 'db_admin', 'PASSWORD': '********************', 'HOST': 'royals-staging.c45efoz9gwow.eu-west-2.rds.amazonaws.com', 'ATOMIC_REQUESTS': False, 'AUTOCOMMIT': True, 'CONN_MAX_AGE': 0, 'OPTIONS': {}, 'TIME_ZONE': None, 'PORT': '', 'TEST': {'CHARSET': None, 'COLLATION': None, 'NAME': None, 'MIRROR': None}}}
DATABASE_ROUTERS = []
DATA_UPLOAD_MAX_MEMORY_SIZE = 2621440
DATA_UPLOAD_MAX_NUMBER_FIELDS = None
DATETIME_FORMAT = 'N j, Y, P'
DATETIME_INPUT_FORMATS = ['%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M:%S.%f', '%Y-%m-%d %H:%M', '%Y-%m-%d', '%m/%d/%Y %H:%M:%S', '%m/%d/%Y %H:%M:%S.%f', '%m/%d/%Y %H:%M', '%m/%d/%Y', '%m/%d/%y %H:%M:%S', '%m/%d/%y %H:%M:%S.%f', '%m/%d/%y %H:%M', '%m/%d/%y']
DATE_FORMAT = 'N j, Y'
DATE_INPUT_FORMATS = ['%Y-%m-%d', '%m/%d/%Y', '%m/%d/%y', '%b %d %Y', '%b %d, %Y', '%d %b %Y', '%d %b, %Y', '%B %d %Y', '%B %d, %Y', '%d %B %Y', '%d %B, %Y']
DEBUG = True
DEBUG_PROPAGATE_EXCEPTIONS = False
DECIMAL_SEPARATOR = '.'
DEFAULT_CHARSET = 'utf-8'
DEFAULT_CONTENT_TYPE = 'text/html'
DEFAULT_EXCEPTION_REPORTER_FILTER = 'django.views.debug.SafeExceptionReporterFilter'
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
DEFAULT_FROM_EMAIL = 'webmaster@localhost'
DEFAULT_INDEX_TABLESPACE = ''
DEFAULT_TABLESPACE = ''
DISALLOWED_USER_AGENTS = []
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'localhost'
EMAIL_HOST_PASSWORD = '********************'
EMAIL_HOST_USER = ''
EMAIL_PORT = 25
EMAIL_SSL_CERTFILE = None
EMAIL_SSL_KEYFILE = '********************'
EMAIL_SUBJECT_PREFIX = '[Django] '
EMAIL_TIMEOUT = None
EMAIL_USE_LOCALTIME = False
EMAIL_USE_SSL = False
EMAIL_USE_TLS = False
FILE_CHARSET = 'utf-8'
FILE_UPLOAD_DIRECTORY_PERMISSIONS = None
FILE_UPLOAD_HANDLERS = ['django.core.files.uploadhandler.TemporaryFileUploadHandler']
FILE_UPLOAD_MAX_MEMORY_SIZE = 2621440
FILE_UPLOAD_PERMISSIONS = None
FILE_UPLOAD_TEMP_DIR = None
FIRST_DAY_OF_WEEK = 0
FIXTURE_DIRS = []
FORCE_SCRIPT_NAME = None
FORMAT_MODULE_PATH = None
FORM_RENDERER = 'django.forms.renderers.DjangoTemplates'
FREE_PACKAGE_CODE = 'free'
FREE_START_COINS = 100
GOOGLE_SERVICE_ACCOUNT = {'auth_provider_x509_cert_url': 'https://www.googleapis.com/oauth2/v1/certs', 'auth_uri': 'https://accounts.google.com/o/oauth2/auth', 'private_key': '********************', 'client_email': 'service-account-google-play@api-8152246798553305834-452549.iam.gserviceaccount.com', 'private_key_id': '********************', 'client_id': '111418087021111754424', 'token_uri': '********************', 'project_id': 'api-8152246798553305834-452549', 'type': 'service_account', 'client_x509_cert_url': 'https://www.googleapis.com/robot/v1/metadata/x509/service-account-google-play%40api-8152246798553305834-452549.iam.gserviceaccount.com'}
IGNORABLE_404_URLS = []
INSTALLED_APPS = ['liststyle', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'django.contrib.gis', 'rest_framework', 'rest_framework.authtoken', 'rest_framework_swagger', 'rest_framework_tracking', 'drf_yasg', 'rangefilter', 'django_extensions', 'social_django', 'itunesiap', 'mapwidgets', 'storages', 'push_notifications', 'positions', 'django_slack', 'users', 'events', 'packs', 'brands', 'iap', 'matches', 'chat', 'notifications', 'rankings', 'codes', 'common.celery_tasks', 'analysis', 'advertisements', 'raven.contrib.django.raven_compat', 'django_admin_listfilter_dropdown', 'common.admin_list_filters', 'common.admin_rangefilter', 'common.textcomplete', 'drf_multiple_model']
INTERNAL_IPS = ['127.0.0.1', '0.0.0.0', 'localhost']
ITUNESIAP_ENV = <Environment use_production=False use_sandbox=True timeout=30.0 exclude_old_transactions=False verify_ssl=True>
LANGUAGES = "(('en', 'English'), ('pl', 'Polish'))"
LANGUAGES_BIDI = ['he', 'ar', 'fa', 'ur']
LANGUAGE_CODE = 'en-us'
LANGUAGE_COOKIE_AGE = None
LANGUAGE_COOKIE_DOMAIN = None
LANGUAGE_COOKIE_NAME = 'django_language'
LANGUAGE_COOKIE_PATH = '/'
LEVEL_FOR_NEW_USER = 7
LOCALE_PATHS = "('/webapps/royals/royals/royals/locale',)"
LOGGING = {'version': 1, 'disable_existing_loggers': False, 'handlers': {'console': {'class': 'logging.StreamHandler'}}}
LOGGING_CONFIG = 'logging.config.dictConfig'
LOGIN_REDIRECT_URL = '/accounts/profile/'
LOGIN_URL = '/accounts/login/'
LOGOUT_REDIRECT_URL = None
MANAGERS = []
MAP_WIDGETS = {'GOOGLE_MAP_API_KEY': '********************'}
MAX_PHOTOS_NUMBER = 7
MAX_USERS_SEEN = 20
MAX_WAITING_MATCH = 6
MEDIA_ROOT = ''
MEDIA_URL = ''
MESSAGE_STORAGE = 'django.contrib.messages.storage.fallback.FallbackStorage'
MIDDLEWARE = None
MIDDLEWARE_CLASSES = ['raven.contrib.django.middleware.DjangoRestFrameworkCompatMiddleware', 'raven.contrib.django.middleware.SentryMiddleware', 'django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.locale.LocaleMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware', 'social_django.middleware.SocialAuthExceptionMiddleware', 'users.middleware.LastActivityMiddleware']
MIGRATION_MODULES = {}
MONTH_DAY_FORMAT = 'F j'
NUMBER_GROUPING = 0
PACK_PRICE_DECAY_INTERVAL = datetime.timedelta(0, 360)
PACK_PRICE_DECAY_VALUE = 1
PASSWORD_HASHERS = '********************'
PASSWORD_RESET_TIMEOUT_DAYS = '********************'
PREPEND_WWW = False
PROJECT_DIR = '/webapps/royals/royals'
PUSH_NOTIFICATIONS_SETTINGS = {'APNS_CERTIFICATE': '/home/royals/pushcert.pem', 'APNS_TOPIC': 'com.Royalsapp.Stage', 'APNS_USE_SANDBOX': False, 'FCM_API_KEY': '********************', 'UPDATE_ON_DUPLICATE_REG_ID': True, 'CONFIG': 'push_notifications.conf.LegacyConfig', 'GCM_POST_URL': 'https://android.googleapis.com/gcm/send', 'GCM_MAX_RECIPIENTS': 1000, 'GCM_ERROR_TIMEOUT': None, 'FCM_POST_URL': 'https://fcm.googleapis.com/fcm/send', 'FCM_MAX_RECIPIENTS': 1000, 'FCM_ERROR_TIMEOUT': None, 'APNS_USE_ALTERNATIVE_PORT': False, 'WNS_PACKAGE_SECURITY_ID': None, 'WNS_SECRET_KEY': '********************', 'WNS_ACCESS_URL': 'https://login.live.com/accesstoken.srf', 'WP_POST_URL': {'CHROME': 'https://fcm.googleapis.com/fcm/send', 'OPERA': 'https://fcm.googleapis.com/fcm/send', 'FIREFOX': 'https://updates.push.services.mozilla.com/wpush/v2'}, 'WP_PRIVATE_KEY': '********************', 'WP_CLAIMS': None, 'WP_ERROR_TIMEOUT': None, 'USER_MODEL': 'users.User'}
RAVEN_CONFIG = {'dsn': 'https://d47b828ea786480b9e0ed66da56e23c0:f62d6e3f2d844c578b36c0bd5b16270b@sentry.royalsapp.com/6', 'release': 'c7b8dd0047c7a039067f0a29950d776c1a9532af'}
REFERRAL_COINS = 100
REST_FRAMEWORK = {'DEFAULT_AUTHENTICATION_CLASSES': ('rest_framework.authentication.TokenAuthentication',), 'DEFAULT_PERMISSION_CLASSES': ('rest_framework.permissions.IsAuthenticated', 'users.permissions.IsCompleted'), 'EXCEPTION_HANDLER': 'royals.utils.custom_exception_handler'}
ROOT_URLCONF = 'royals.urls'
SCORE_FOR_BEING_SELECTED_IN_MATCH = 1
SCORE_TO_LEVEL_UP = [10, 25, 50, 85, 135, 270, 500, 900, 1500]
SECRET_KEY = '********************'
SECURE_BROWSER_XSS_FILTER = False
SECURE_CONTENT_TYPE_NOSNIFF = False
SECURE_HSTS_INCLUDE_SUBDOMAINS = False
SECURE_HSTS_PRELOAD = False
SECURE_HSTS_SECONDS = 0
SECURE_PROXY_SSL_HEADER = None
SECURE_REDIRECT_EXEMPT = []
SECURE_SSL_HOST = None
SECURE_SSL_REDIRECT = False
SEND_INFO_MATCH_AFTER_SECOND = 600
SERVER_EMAIL = 'root@localhost'
SESSION_CACHE_ALIAS = 'default'
SESSION_COOKIE_AGE = 1209600
SESSION_COOKIE_DOMAIN = None
SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_NAME = 'sessionid'
SESSION_COOKIE_PATH = '/'
SESSION_COOKIE_SECURE = False
SESSION_ENGINE = 'django.contrib.sessions.backends.db'
SESSION_EXPIRE_AT_BROWSER_CLOSE = False
SESSION_FILE_PATH = None
SESSION_SAVE_EVERY_REQUEST = False
SESSION_SERIALIZER = 'django.contrib.sessions.serializers.JSONSerializer'
SETTINGS_MODULE = 'royals.settings.staging'
SHORT_DATETIME_FORMAT = 'm/d/Y P'
SHORT_DATE_FORMAT = 'm/d/Y'
SIGNING_BACKEND = 'django.core.signing.TimestampSigner'
SILENCED_SYSTEM_CHECKS = []
SLACK_CHANNEL = '#alerty_małe'
SLACK_TOKEN = '********************'
SLACK_USERNAME = 'backend'
SOCIAL_AUTH_FACEBOOK_KEY = '********************'
SOCIAL_AUTH_FACEBOOK_PROFILE_EXTRA_PARAMS = {'fields': 'id, name'}
SOCIAL_AUTH_FACEBOOK_SECRET = '********************'
STATICFILES_DIRS = []
STATICFILES_FINDERS = ['django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder']
STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.StaticFilesStorage'
STATIC_ROOT = '/webapps/royals/static'
STATIC_URL = '/static/'
TEMPLATES = [{'BACKEND': 'django.template.backends.django.DjangoTemplates', 'DIRS': ['/webapps/royals/royals/royals/../templates'], 'APP_DIRS': True, 'OPTIONS': {'context_processors': ['django.template.context_processors.debug', 'django.template.context_processors.request', 'django.contrib.auth.context_processors.auth', 'django.contrib.messages.context_processors.messages', 'django.template.context_processors.i18n']}}]
TEST_NON_SERIALIZED_APPS = []
TEST_RUNNER = 'django.test.runner.DiscoverRunner'
THOUSAND_SEPARATOR = ','
TIME_FORMAT = 'P'
TIME_INPUT_FORMATS = ['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
TIME_ZONE = 'Europe/Warsaw'
USE_ETAGS = False
USE_I18N = True
USE_L10N = True
USE_THOUSAND_SEPARATOR = False
USE_TZ = True
USE_X_FORWARDED_HOST = False
USE_X_FORWARDED_PORT = False
WSGI_APPLICATION = 'royals.wsgi.application'
X_FRAME_OPTIONS = 'SAMEORIGIN'
YEAR_MONTH_FORMAT = 'F Y'


You're seeing this error because you have DEBUG = True in your
Django settings file. Change that to False, and Django will
display a standard page generated by the handler for this status code.