# Xojo 2020R2 app crashes with display window problem in Catalina

**URL:** <https://forum.xojo.com/t/xojo-2020r2-app-crashes-with-display-window-problem-in-catalina/59726>\
**Category:** macOS\
**Created:** [December 11, 2020, 10:11pm UTC](https://forum.xojo.com/t/xojo-2020r2-app-crashes-with-display-window-problem-in-catalina/59726 "2020-12-11T22:11:37Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Tim\_Parnell](https://forum.xojo.com/user_avatar/forum.xojo.com/tim_parnell/32/161_2.png) [@Tim\_Parnell](https://forum.xojo.com/u/Tim_Parnell)\
**Post date:** [December 12, 2020, 10:10pm UTC](https://forum.xojo.com/t/xojo-2020r2-app-crashes-with-display-window-problem-in-catalina/59726/9 "2020-12-12T22:10:49Z")

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The [last](https://forum.xojo.com/t/canvas-firing-paint-event-until-crashing-the-app-in-mojave/46745) [couple of times](https://forum.xojo.com/t/app-store-rejection-for-app-built-with-2018r4/46629/12) this issue has come up, it was drawing code that needed to be improved to prevent infinite events. In other words, check to make sure your Paint code _only draws_ and isn’t inadvertently causing a Paint loop.

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