Version of SearXNG, commit number if you are using on master branch and stipulate if you forked SearXNG
Commit 3bf7024, 23 september of 2025
SO: Linux 6.1.0-40-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.153-1 (2025-09-20) x86_64 GNU/Linux
How did you install SearXNG?
I installed SearxNG a few years ago using the installation script from the official wiki.
What happened?
I my instance is private and for personal use only, so I don't update it frequently, I updated after some months to that version prevoiusly specified, and now SearxNG does not start properly.

When I turn on my computer, SearxNG starts, but it doesn't work. The error I get from the browser is error code 500, with the text from uWSGI:«Internal Server Error». If then I exec from the terminal:

sudo systemctl restart uwsgi

And reload the page, then all goes well, the bug disappears.
How To Reproduce
Installing SearxNG from the installation script, and turning on the computer with SearxNG activated from start (which does it automatically, I think).
Expected behavior
No http error code if I don't manually restart the service.
Screenshots & Logs
Here I show some part of the log of uWSGI (located in /var/log/uwsgi/app/searxng.log) when the bug is produced:

Sat Sep 27 11:36:45 2025 - *** Starting uWSGI 2.0.21-debian (64bit) on [Sat Sep 27 11:36:44 2025] ***
Sat Sep 27 11:36:45 2025 - compiled with version: 12.2.0 on 19 May 2023 13:59:29
Sat Sep 27 11:36:45 2025 - os: Linux-6.1.0-40-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.153-1 (2025-09-20)
Sat Sep 27 11:36:45 2025 - nodename: Name
Sat Sep 27 11:36:45 2025 - machine: x86_64
Sat Sep 27 11:36:45 2025 - clock source: unix
Sat Sep 27 11:36:45 2025 - pcre jit disabled
Sat Sep 27 11:36:45 2025 - detected number of CPU cores: 12
Sat Sep 27 11:36:45 2025 - current working directory: /
Sat Sep 27 11:36:45 2025 - writing pidfile to /run/uwsgi/app/searxng/pid
Sat Sep 27 11:36:45 2025 - detected binary path: /usr/bin/uwsgi-core
Sat Sep 27 11:36:45 2025 - chdir() to /usr/local/searxng/searxng-src/searx
Sat Sep 27 11:36:45 2025 - your processes number limit is 60024
Sat Sep 27 11:36:45 2025 - your memory page size is 4096 bytes
Sat Sep 27 11:36:45 2025 - detected max file descriptor number: 1024
Sat Sep 27 11:36:45 2025 - building mime-types dictionary from file /etc/mime.types...Sat Sep 27 11:36:45 2025 - 1549 entry found
Sat Sep 27 11:36:45 2025 - lock engine: pthread robust mutexes
Sat Sep 27 11:36:45 2025 - thunder lock: disabled (you can enable it with --thunder-lock)
Sat Sep 27 11:36:45 2025 - uwsgi socket 0 bound to UNIX address /run/uwsgi/app/searxng/socket fd 3
Sat Sep 27 11:36:45 2025 - uwsgi socket 1 bound to UNIX address /usr/local/searxng/run/socket fd 5
Sat Sep 27 11:36:45 2025 - setgid() to 996
Sat Sep 27 11:36:45 2025 - setuid() to 996
Sat Sep 27 11:36:45 2025 - Python version: 3.11.2 (main, Apr 28 2025, 14:11:48) [GCC 12.2.0]
Sat Sep 27 11:36:45 2025 - PEP 405 virtualenv detected: /usr/local/searxng/searx-pyenv
Sat Sep 27 11:36:45 2025 - Set PythonHome to /usr/local/searxng/searx-pyenv
Sat Sep 27 11:36:46 2025 - Python main interpreter initialized at 0x7f994f960018
Sat Sep 27 11:36:46 2025 - python threads support enabled
Sat Sep 27 11:36:46 2025 - your server socket listen backlog is limited to 100 connections
Sat Sep 27 11:36:46 2025 - your mercy for graceful operations on workers is 60 seconds
Sat Sep 27 11:36:46 2025 - mapped 231048 bytes (225 KB) for 2 cores
Sat Sep 27 11:36:46 2025 - *** Operational MODE: preforking ***
Sat Sep 27 11:36:46 2025 - added /usr/local/searxng/searxng-src/ to pythonpath.
Sat Sep 27 11:36:46 2025 - spawned uWSGI master process (pid: 1442)
Sat Sep 27 11:36:46 2025 - spawned uWSGI worker 1 (pid: 1460, cores: 1)
Sat Sep 27 11:36:46 2025 - spawned uWSGI worker 2 (pid: 1463, cores: 1)
Sat Sep 27 11:36:46 2025 - spawned 12 offload threads for uWSGI worker 1
Sat Sep 27 11:36:46 2025 - spawned 12 offload threads for uWSGI worker 2
Traceback (most recent call last):
File "/usr/local/searxng/searxng-src/searx/webapp.py", line 1418, in
init()
File "/usr/local/searxng/searxng-src/searx/webapp.py", line 1389, in init
searx.search.initialize(enable_checker=True, check_network=True, enable_metrics=metrics)
File "/usr/local/searxng/searxng-src/searx/search/init.py", line 46, in initialize
PROCESSORS.init(settings_engines)
File "/usr/local/searxng/searxng-src/searx/search/processors/init.py", line 70, in init
eng_proc.initialize(self.register_processor)
File "/usr/local/searxng/searxng-src/searx/search/processors/online_currency.py", line 56, in initialize
CURRENCIES.init()
File "/usr/local/searxng/searxng-src/searx/data/currencies.py", line 26, in init
if self.cache.properties("currencies loaded") != "OK":
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/searxng/searxng-src/searx/sqlitedb.py", line 381, in call
res = self.DB.execute(self.SQL_GET, (name,)).fetchone()
^^^^^^^
File "/usr/local/searxng/searxng-src/searx/sqlitedb.py", line 269, in DB
conn = DBSession.get_connect(self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/searxng/searxng-src/searx/sqlitedb.py", line 54, in get_connect
return session.conn
^^^^^^^^^^^^
File "/usr/local/searxng/searxng-src/searx/sqlitedb.py", line 70, in conn
self._conn = self.app.connect()
^^^^^^^^^^^^^^^^^^
File "/usr/local/searxng/searxng-src/searx/sqlitedb.py", line 213, in connect
with self._connect() as conn:
^^^^^^^^^^^^^^^
File "/usr/local/searxng/searxng-src/searx/sqlitedb.py", line 192, in _connect
conn.execute(f"PRAGMA journal_mode={self.SQLITE_JOURNAL_MODE}")
sqlite3.OperationalError: database is locked
Sat Sep 27 11:37:13 2025 - unable to load app 0 (mountpoint='') (callable not found or import error)
Sat Sep 27 11:37:13 2025 - *** no app loaded. going in full dynamic mode ***
Sat Sep 27 11:40:44 2025 - --- no python application found, check your startup logs for errors ---
Sat Sep 27 11:41:30 2025 - SIGINT/SIGTERM received...killing workers...
Traceback (most recent call last):
File "/usr/local/searxng/searxng-src/searx/webapp.py", line 1418, in
init()
File "/usr/local/searxng/searxng-src/searx/webapp.py", line 1389, in init
searx.search.initialize(enable_checker=True, check_network=True, enable_metrics=metrics)
File "/usr/local/searxng/searxng-src/searx/search/init.py", line 46, in initialize
PROCESSORS.init(settings_engines)
File "/usr/local/searxng/searxng-src/searx/search/processors/init.py", line 70, in init
eng_proc.initialize(self.register_processor)
File "/usr/local/searxng/searxng-src/searx/search/processors/online_currency.py", line 56, in initialize
CURRENCIES.init()
File "/usr/local/searxng/searxng-src/searx/data/currencies.py", line 29, in init
self.load()
File "/usr/local/searxng/searxng-src/searx/data/currencies.py", line 39, in load
self.cache.set(key=key, value=value, ctx=self.ctx_names, expire=None)
File "/usr/local/searxng/searxng-src/searx/cache.py", line 367, in set
self.DB.execute(sql, (key, value, expire, value, expire))
KeyboardInterrupt
Sat Sep 27 11:41:30 2025 - unable to load app 0 (mountpoint='') (callable not found or import error)
Sat Sep 27 11:41:30 2025 - *** no app loaded. going in full dynamic mode ***
Sat Sep 27 11:41:31 2025 - worker 2 buried after 1 seconds

I don't have anything like an SQL database installed, I don't use nor redis, nor valkey, nor morty. My instance is kept minimal for my personal use.

The surprising fact is that I have the currencies engine disabled in my config.yml, so it should not provoke any bug. That idea was suggested by the user searxng_bridged in the Libera chat a few days ago.

Additional context
Nothing more.