# Add-on issues with Anki 2.1.50 Beta

**URL:** <https://forums.ankiweb.net/t/add-on-issues-with-anki-2-1-50-beta/15631>\
**Category:** Beta Testing\
**Created:** [December 5, 2021, 12:14am UTC](https://forums.ankiweb.net/t/add-on-issues-with-anki-2-1-50-beta/15631 "2021-12-05T00:14:55Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![tatsumoto](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/tatsumoto/32/5411_2.png) [@tatsumoto](https://forums.ankiweb.net/u/tatsumoto)\
**Post date:** [December 4, 2021, 10:46pm UTC](https://forums.ankiweb.net/t/add-on-issues-with-anki-2-1-50-beta/15631/7 "2021-12-04T22:46:32Z")

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I get `NameError: name 'isWin' is not defined` when I try to run the beta. Please stop removing stuff that add-ons use.

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