# Anki crashed and said to copy and post this code in this forum

**URL:** <https://forums.ankiweb.net/t/anki-crashed-and-said-to-copy-and-post-this-code-in-this-forum/71457>\
**Category:** Help\
**Created:** [October 15, 2026, 7:58am UTC](https://forums.ankiweb.net/t/anki-crashed-and-said-to-copy-and-post-this-code-in-this-forum/71457 "2026-10-15T07:58:34Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![sleekynoyrtaki2](https://avatars.discourse-cdn.com/v4/letter/s/df705f/32.png) [@sleekynoyrtaki2](https://forums.ankiweb.net/u/sleekynoyrtaki2)\
**Post date:** [October 15, 2026, 7:58am UTC](https://forums.ankiweb.net/t/anki-crashed-and-said-to-copy-and-post-this-code-in-this-forum/71457/1 "2026-10-15T07:58:35Z")

</div>

Anki 26.09.3 (29bb700b)  
Python 3.13.15 Qt 6.11.2 PyQt 6.11.0  
Platform: Windows-10-10.0.19045-SP0

Traceback (most recent call last):  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\aqt\taskman.py”, line 148, in _on\_closures\_pending  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\aqt\taskman.py”, line 88, in  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\aqt\taskman.py”, line 111, in wrapped\_done  
File "D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\aqt\operations\_init_.py", line 123, in wrapped\_done  
File “concurrent\futures\_base.py”, line 453, in result  
File “concurrent\futures\_base.py”, line 402, in \__get\_result  
File “concurrent\futures\thread.py”, line 59, in run  
File "D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\aqt\operations\_init_.py", line 108, in wrapped\_op  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\aqt\operations\note.py”, line 22, in  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\anki\collection.py”, line 540, in add\_note  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\anki\_backend\_generated.py”, line 1450, in add\_note  
File “D:\a\anki\anki\out\installer\build\anki\windows\visualstudio\x64\Release\app\_packages\anki\_backend.py”, line 162, in \_run\_command  
pyo3\_runtime.PanicException: assertion `left == right` failed  
left: 1792050922622  
right: 0

---

<div class="post-metadata">

**Author:** ![Danika\_Dakika](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/danika_dakika/32/17815_2.png) [@Danika\_Dakika](https://forums.ankiweb.net/u/Danika_Dakika)\
**Post date:** [October 15, 2026, 8:13am UTC](https://forums.ankiweb.net/t/anki-crashed-and-said-to-copy-and-post-this-code-in-this-forum/71457/2 "2026-10-15T08:13:59Z")

</div>

You should start with the [Troubleshooting Checklist](https://docs.ankiweb.net/troubleshooting.html) – and try everything, including the things you don’t think are relevant.

If you continue seeing the crash, make sure when you respond to let us know what you’ve tried, and _what you’re doing_ when the crash happens.

---

<div class="post-metadata">

**Author:** ![tekboart](https://avatars.discourse-cdn.com/v4/letter/t/ee7513/32.png) [@tekboart](https://forums.ankiweb.net/u/tekboart)\
**Post date:** [October 15, 2026, 11:07am UTC](https://forums.ankiweb.net/t/anki-crashed-and-said-to-copy-and-post-this-code-in-this-forum/71457/3 "2026-10-15T11:07:28Z")

</div>

I have the exact problem, after upgrading to anki .ver `26.09.3`.

Note: When I use .ver `25.09.4`, everything works fine.

# What is wrong?

- When I click on `Tools > Check Media`, Anki crashes.
- It’s complaining about a file named `pronunciation_de_busse.mp3`, which I have had in my collection for 7 years now. I have checked, and there is only once instance of the mentioned file and it has no umlauts.

# My specs

- OS: Linux
- Distro: Kubuntu
- Desktop Env: KDE Plasma 6.6.6
- QT ver: 6.10.2

# What I have tried already:

- Check Database

> It says:  
> Added last review time to ⁨2⁩ cards.  
> Database rebuilt and optimized.

- Restart Anki
- Restart OS
- Try it on other devices
- Run Anki without addons (holding down Shift)

# Debug Info

```auto
Anki 26.09.3 (29bb700b) 
Python 3.13.15 Qt 6.11.2 PyQt 6.11.0
Platform: Linux-7.0.0-38-generic-x86_64-with-glibc2.43

Traceback (most recent call last):
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/aqt/taskman.py", line 148, in _on_closures_pending
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/aqt/taskman.py", line 88, in <lambda>
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/aqt/mediacheck.py", line 105, in _on_finished
  File "/usr/local/share/anki/python/lib/python3.13/concurrent/futures/_base.py", line 453, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~ ^^
  File "/usr/local/share/anki/python/lib/python3.13/concurrent/futures/_base.py", line 402, in __get_result
    raise self._exception
  File "/usr/local/share/anki/python/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/aqt/mediacheck.py", line 94, in _check
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/anki/media.py", line 181, in check
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/anki/_backend_generated.py", line 2066, in check_media
  File "/home/runner/work/anki/anki/out/installer/build/anki/linux/zip/anki/app_packages/anki/_backend.py", line 162, in _run_command
pyo3_runtime.PanicException: assertion `left != right` failed
  left: "pronunciation_de_busse.mp3"
 right: "pronunciation_de_busse.mp3"

```