# Screen shows 1 sec and then becomes blank

**URL:** https://community.thunkable.com/t/screen-shows-1-sec-and-then-becomes-blank/1411166
**Category:** Questions about Thunkable X
**Created:** [July 23, 2021, 6:51pm UTC](https://community.thunkable.com/t/screen-shows-1-sec-and-then-becomes-blank/1411166 "2021-07-23T18:51:53Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![tatiang](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/tatiang/32/55482_2.png) [@tatiang](https://community.thunkable.com/u/tatiang)
#### Post date: [July 25, 2021, 12:02am UTC](https://community.thunkable.com/t/screen-shows-1-sec-and-then-becomes-blank/1411166/5 "2021-07-25T00:02:57Z")

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I’ve used Haversine. It’s very tricky to get the right answer but it shouldn’t crash your app unless you’re dividing by zero or something like that.

Try debugging by adding Wait blocks and changing label values to highlight where in the code you’ve reached right _before_ it crashes. This is my process: [Debugging in Thunkable X (Video)](https://community.thunkable.com/t/debugging-in-thunkable-x-video/849471).

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