# Screen crashes app in live preview but loads just fine in web preview
**URL:** https://community.thunkable.com/t/screen-crashes-app-in-live-preview-but-loads-just-fine-in-web-preview/2978172
**Category:** Questions about Thunkable X
**Created:** [April 30, 2024, 7:06pm UTC](https://community.thunkable.com/t/screen-crashes-app-in-live-preview-but-loads-just-fine-in-web-preview/2978172 "2024-04-30T19:06:35Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@anxirileyrhsuqv](https://community.thunkable.com/u/anxirileyrhsuqv)
#### Post date: [April 30, 2024, 7:06pm UTC](https://community.thunkable.com/t/screen-crashes-app-in-live-preview-but-loads-just-fine-in-web-preview/2978172/1 "2024-04-30T19:06:35Z")
basically title.
i’m testing an app in the thunkable live testing app, and it crashes upon opening a certain page. however, on the web preview, it loads just fine.
this is what it loads normally on the web preview:
and these are the blocks open the page opening:
what could be malfunctioning?
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### Author:  [@matt\_conroy](https://community.thunkable.com/u/matt_conroy)
#### Post date: [May 1, 2024, 2:12pm UTC](https://community.thunkable.com/t/screen-crashes-app-in-live-preview-but-loads-just-fine-in-web-preview/2978172/2 "2024-05-01T14:12:09Z")
Hi @anxirileyrhsuqv, thanks for reaching out.
Is this still an issue for you? We took a look at the app on Thunkable Live but the language settings page does not seem to be crashing the app.
If it is, one place to look is at your conditionals and do some debugging to test those and ensure that they are returning null values–this can cause a mobile app to crash but is sometimes handled better on the web.
There is a great post by our Power User Tatian about how to best debug in Thunkable. Take a look and let us know what you find!
> [@Debugging in Thunkable X (Video)](https://community.thunkable.com/t/debugging-in-thunkable-x-video/849471):
>
> I thought I’d share a process I use for debugging my projects. It involves creating a function that can be used over and over throughout the code blocks in order to help determine where things are going wrong, whether or not certain blocks are ever triggering, and what the values of several variables are. Here’s a screenshot of what I’ve set up: The real power comes from being able to quickly change the delay (and even set it to 0 seconds) or just remo…
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### Author:  [@system](https://community.thunkable.com/u/system)
#### Post date: [July 30, 2024, 2:12pm UTC](https://community.thunkable.com/t/screen-crashes-app-in-live-preview-but-loads-just-fine-in-web-preview/2978172/3 "2024-07-30T14:12:53Z")
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