**Describe the bug** When I want to open the component-List of a project, I get an internal server error. This happens for all configured projects. If the user has the project configured as watched project, the components are getting listet on the dashboard an stepping directly to the works like expected. The projects are configured with "private" access control but it doesn't make a difference if set to "public". **To Reproduce** Steps to reproduce the behavior: 1. Go to 'Projects' -> 'Browse all projects' 2. Click on any project 3. See error **Expected behavior** The list of the components for the project **Server configuration and status** Installation is done via pip3 on debian 10 ***weblate list_versions * Weblate: 4.1.1 * Django: 3.0.8 * siphashc: 1.3 * Whoosh: 2.7.4 * translate-toolkit: 3.0.0 * lxml: 4.5.2 * Pillow: 7.1.2 * bleach: 3.1.5 * python-dateutil: 2.8.1 * social-auth-core: 3.3.3 * social-auth-app-django: 3.4.0 * django-crispy-forms: 1.9.2 * oauthlib: 3.1.0 * django-compressor: 2.4 * djangorestframework: 3.11.0 * django-filter: 2.3.0 * django-appconf: 1.0.4 * user-agents: 2.1 * filelock: 3.0.12 * setuptools: 40.8.0 * jellyfish: 0.8.2 * openpyxl: 3.0.4 * celery: 4.4.6 * kombu: 4.6.11 * translation-finder: 2.1 * html2text: 2020.1.16 * pycairo: 1.19.1 * pygobject: 3.30.4 * diff-match-patch: 20181111 * requests: 2.21.0 * django-redis: 4.12.1 * hiredis: 1.0.1 * sentry_sdk: 0.15.1 * Cython: 0.29.21 * misaka: 2.1.1 * GitPython: 3.1.7 * borgbackup: 1.1.13 * pyparsing: 2.4.7 * Python: 3.7.3 * Git: 2.20.1 * phply: 1.2.5 * chardet: 3.0.4 * ruamel.yaml: 0.16.10 * mysqlclient: 2.0.1 * git-review: 1.27.0 * Redis server: 5.0.3 * MariaDB sever: 10.3.22 * Database backends: django.db.backends.mysql * Cache backends: default:RedisCache, avatar:FileBasedCache * Email setup: django.core.mail.backends.smtp.EmailBackend: irrelevant * OS encoding: filesystem=utf-8, default=utf-8 * Celery: redis://localhost:6379, redis://localhost:6379, regular * Platform: Linux 4.19.0-9-amd64 (x86_64) ***apache-config*** ``` ServerAdmin irrelevant ServerName irrelevant # DATA_DIR/static/favicon.ico Alias /favicon.ico /usr/local/lib/python3.7/dist-packages/weblate/static/favicon.ico # DATA_DIR/static/ Alias /static/CACHE/ /var/lib/weblate/static/CACHE/ Require all granted Alias /static/admin/ /usr/local/lib/python3.7/dist-packages/django/contrib/admin/static/admin/ Require all granted Alias /static/ /usr/local/lib/python3.7/dist-packages/weblate/static/ Require all granted # DATA_DIR/media/ Alias /media/ /var/lib/weblate/media/ Require all granted WSGIDaemonProcess weblate python-path=/usr/local/lib/python3.7/dist-packages/weblate/ WSGIProcessGroup weblate WSGIApplicationGroup %{GLOBAL} WSGIScriptAlias / /usr/local/lib/python3.7/dist-packages/weblate/wsgi.py process-group=weblate WSGIPassAuthorization On Require all granted TimeOut 3600 ProxyTimeOut 3600 ``` **Weblate deploy checks** ``` weblate check --deploy System check identified some issues: WARNINGS: ?: (security.W004) You have not set a value for the SECURE_HSTS_SECONDS setting. If your entire site is served only over SSL, you may want to consider setting a value and enabling HTTP Strict Transport Security. Be sure to read the documentation first; enabling HSTS carelessly can cause serious, irreversible problems. ?: (security.W008) Your SECURE_SSL_REDIRECT setting is not set to True. Unless your site should be available over both SSL and non-SSL connections, you may want to either set this setting True or configure a load balancer or reverse-proxy server to redirect all connections to HTTPS. ?: (security.W012) SESSION_COOKIE_SECURE is not set to True. Using a secure-only session cookie makes it more difficult for network traffic sniffers to hijack user sessions. ?: (weblate.W025.ass) Failure in loading handler for ass file format: aeidon or gaupol package required for Subtitle support HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#optional-deps ?: (weblate.W025.ini) Failure in loading handler for ini file format: Missing iniparse library. HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#optional-deps ?: (weblate.W025.islu) Failure in loading handler for islu file format: Missing iniparse library. HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#optional-deps ?: (weblate.W025.srt) Failure in loading handler for srt file format: aeidon or gaupol package required for Subtitle support HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#optional-deps ?: (weblate.W025.ssa) Failure in loading handler for ssa file format: aeidon or gaupol package required for Subtitle support HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#optional-deps ?: (weblate.W025.sub) Failure in loading handler for sub file format: aeidon or gaupol package required for Subtitle support HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#optional-deps ?: (weblate.W033.GitHub) Failure in loading VCS module for GitHub: [Errno 2] No such file or directory: 'hub': 'hub' HINT: https://docs.weblate.org/en/weblate-4.1.1/vcs.html ?: (weblate.W033.GitLab) Failure in loading VCS module for GitLab: [Errno 2] No such file or directory: 'lab': 'lab' HINT: https://docs.weblate.org/en/weblate-4.1.1/vcs.html ?: (weblate.W033.Mercurial) Failure in loading VCS module for Mercurial: [Errno 2] No such file or directory: 'hg': 'hg' HINT: https://docs.weblate.org/en/weblate-4.1.1/vcs.html ?: (weblate.W033.Subversion) Failure in loading VCS module for Subversion: git: 'svn' is not a git command. See 'git --help'. The most similar command is serve (1) HINT: https://docs.weblate.org/en/weblate-4.1.1/vcs.html INFOS: ?: (weblate.I021) Error collection is not set up, it is highly recommended for production use HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/install.html#collecting-errors ?: (weblate.I028) Backups are not configured, it is highly recommended for production use HINT: https://docs.weblate.org/en/weblate-4.1.1/admin/backup.html System check identified 15 issues (1 silenced). ``` **Exception traceback** ``` ERROR Internal Server Error: /projects/irrelevant/ Traceback (most recent call last): File "/usr/local/lib/python3.7/dist-packages/django/core/handlers/exception.py", line 34, in inner response = get_response(request) File "/usr/local/lib/python3.7/dist-packages/django/core/handlers/base.py", line 115, in _get_response response = self.process_exception_by_middleware(e, request) File "/usr/local/lib/python3.7/dist-packages/django/core/handlers/base.py", line 113, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/usr/local/lib/python3.7/dist-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func response = view_func(request, *args, **kwargs) File "/usr/local/lib/python3.7/dist-packages/weblate/trans/views/basic.py", line 169, in show_project components = prefetch_tasks(prefetch_stats(get_paginator(request, all_components))) File "/usr/local/lib/python3.7/dist-packages/weblate/trans/models/component.py", line 164, in prefetch_tasks lookup[item].__dict__["background_task"] = AsyncResult(value) File "/usr/local/lib/python3.7/dist-packages/celery/result.py", line 99, in __init__ 'AsyncResult requires valid id, not {0}'.format(type(id))) ValueError: AsyncResult requires valid id, not ``` **Additional context** The system has been set up last week with all the configurations and users set up from scratch. Authentication is done via ldap.

ValueError: AsyncResult requires valid id, not <class 'NoneType'> when opening component-list of project #4247

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