# Null and nan on my counting app
**URL:** https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798
**Category:** Questions about Thunkable X
**Created:** [April 26, 2022, 4:02pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798 "2022-04-26T16:02:31Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@rickwheeler1992](https://community.thunkable.com/u/rickwheeler1992)
#### Post date: [April 26, 2022, 4:02pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/1 "2022-04-26T16:02:31Z")
Thanks for the help. As of now my app works great except one little bug. When I start my app for the first time, where the amount goes I get a null. If I hit a button I get a nan. It’s not a big deal because the app is just for me and if I hit reset it works fine. Although it would be nice to fix it. Here are screenshots.
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### Author:  [@tatiang](https://community.thunkable.com/u/tatiang)
#### Post date: [April 26, 2022, 4:53pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/2 "2022-04-26T16:53:53Z")
When you use Stored variables, you have to give them a starting value.
In your screen opens blocks, do this:
If Stored variable = null
…Set Stored variable to 0.
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### Author:  [@rickwheeler1992](https://community.thunkable.com/u/rickwheeler1992)
#### Post date: [April 26, 2022, 5:05pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/3 "2022-04-26T17:05:20Z")
@tatiang I’m not home, but I’ll try it when I get home. If I set it at zero, do I do it in the block when the screen opens? If so will it be zero every time I open the app? I want every time the app opens for it to pick up where it left off.
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### Author:  [@tatiang](https://community.thunkable.com/u/tatiang)
#### Post date: [April 26, 2022, 5:16pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/4 "2022-04-26T17:16:04Z")
The reason for the conditional IF is that you only set the variable to 0 if it hasn’t been set before. Once you set the variable to 0 it is no longer null. And because it’s a Stored variable, it’s saved to the device. So it gets set to 0 once and then whatever value you change that variable to, it will keep that value and the IF block will not be true ever again.
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### Author:  [@rickwheeler1992](https://community.thunkable.com/u/rickwheeler1992)
#### Post date: [April 26, 2022, 8:16pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/5 "2022-04-26T20:16:00Z")
@tatiang Sorry to be a bother. I was confused how to use the IF conditional that you were talking about. Is the top block of the screenshot right or am I way off?
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### Author:  [@muneer](https://community.thunkable.com/u/muneer)
#### Post date: [April 26, 2022, 8:23pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/6 "2022-04-26T20:23:39Z")
The blocks in the screen Opens are not correct.
You need to check the variable first before assigning it to any other component.
See this simple example
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### Author:  [@rickwheeler1992](https://community.thunkable.com/u/rickwheeler1992)
#### Post date: [April 26, 2022, 9:02pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/7 "2022-04-26T21:02:46Z")
@muneer thank you for trying to help me. I tried the following (screenshot) but I still get null the first time I open the new screen. I guess I’ll just live with it. It’s not a big deal, it’s just an app for myself. I was hoping I could fix it, but unfortunately I’m not the brightest when it comes to this stuff. Thank you very much.
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### Author:  [@muneer](https://community.thunkable.com/u/muneer)
#### Post date: [April 26, 2022, 9:06pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/8 "2022-04-26T21:06:37Z")
I can see from the image
You are testing `Amount 5` instead of the actual `stored variable Running Total 5`. This is the mistake.
Just follow the same example I showed you.
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### Author:  [@rickwheeler1992](https://community.thunkable.com/u/rickwheeler1992)
#### Post date: [April 26, 2022, 9:17pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/9 "2022-04-26T21:17:19Z")
@muneer thank you for being patient with me. I’m not always so bright. I misread your example and when I fixed it like you said, it works perfectly. Thank you. I’m done with my app now so I should be a bother anymore (for the time being at least). Thanks
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### Author:  [@system](https://community.thunkable.com/u/system)
#### Post date: [July 25, 2022, 9:17pm UTC](https://community.thunkable.com/t/null-and-nan-on-my-counting-app/1849798/10 "2022-07-25T21:17:54Z")
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