# Anki 2.1.66 assertion failed: (left == right)

**URL:** <https://forums.ankiweb.net/t/anki-2-1-66-assertion-failed-left-right/43847>\
**Category:** Help\
**Created:** [April 19, 2024, 9:21pm UTC](https://forums.ankiweb.net/t/anki-2-1-66-assertion-failed-left-right/43847 "2024-04-19T21:21:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lola](https://avatars.discourse-cdn.com/v4/letter/l/ed655f/32.png) [@Lola](https://forums.ankiweb.net/u/Lola)\
**Post date:** [April 19, 2024, 9:21pm UTC](https://forums.ankiweb.net/t/anki-2-1-66-assertion-failed-left-right/43847/1 "2024-04-19T21:21:10Z")

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A fatal error occurred, and Anki must close. Please report this message on the forums.  
Anki 2.1.66 (70506aeb) Python 3.9.15 Qt 6.5.2 PyQt 6.5.2  
Platform: Windows-10-10.0.22621  
Flags: frz=True ao=True sv=?  
Add-ons, last update check: 2024-04-19 15:56:59

Caught exception:  
Traceback (most recent call last):  
File “aqt.taskman”, line 122, in \_on\_closures\_pending  
File “aqt.taskman”, line 71, in   
File “aqt.taskman”, line 90, in wrapped\_done  
File “aqt.operations”, line 122, in wrapped\_done  
File “concurrent.futures.\_base”, line 439, in result  
File “concurrent.futures.\_base”, line 391, in \_\_get\_result  
File “concurrent.futures.thread”, line 58, in run  
File “aqt.operations”, line 107, in wrapped\_op  
File “aqt.operations.note”, line 22, in   
File “anki.collection”, line 571, in add\_note  
File “anki.\_backend\_generated”, line 1040, in add\_note  
File “anki.\_backend”, line 145, in \_run\_command  
pyo3\_runtime.PanicException: assertion failed: `(left == right)`  
left: `1713561293224`,  
right: `0`

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<div class="post-metadata">

**Author:** ![NameLessGO](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/namelessgo/32/34298_2.png) [@NameLessGO](https://forums.ankiweb.net/u/NameLessGO)\
**Post date:** [April 19, 2024, 9:23pm UTC](https://forums.ankiweb.net/t/anki-2-1-66-assertion-failed-left-right/43847/2 "2024-04-19T21:23:33Z")

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Update to [latest](https://apps.ankiweb.net/)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\
**Post date:** [May 19, 2024, 9:24pm UTC](https://forums.ankiweb.net/t/anki-2-1-66-assertion-failed-left-right/43847/3 "2024-05-19T21:24:20Z")

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