# \[Solved\] Dataviewer going blank (TypeError: Cannot read property 'toString' of null)

**URL:** https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653
**Category:** Questions about Thunkable X
**Tags:** beginner, data-viewer
**Created:** [March 13, 2021, 12:23pm UTC](https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653 "2021-03-13T12:23:41Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![p.powercoders1i0t](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@p.powercoders1i0t](https://community.thunkable.com/u/p.powercoders1i0t)
#### Post date: [March 13, 2021, 12:23pm UTC](https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653/1 "2021-03-13T12:23:41Z")

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I have this screen with a dataviewer that goes blank when the screen opens.

The data transfering over fine to the Airtable(Homework Helpers - Confirmed):  
 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/2/d/2dab7e97b6b45d418f433e5cbc64c56948bdd168.png)

I think I might be running into an issue when i create a row in the local DB (Students Helping)

**In the console i get this error:**

`TypeError: Cannot read property 'toString' of null,`

The data viewer only shows a line of text,  
 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/7/a/7a679ab7eba02a64694268661664da5fe5177fbd.png)  
(it originally showing and image, but i removed that, thinking that was the problem, but not luck)

Any other ideas to what might be causing me issues? Thank you in advance!

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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: [March 13, 2021, 4:49pm UTC](https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653/2 "2021-03-13T16:49:12Z")

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Does your Students Helping data source get updated when you run the first “create row” block? Is it also in Airtable?

Have you checked the values of those three _stored_ variables right before running that block? For example, by assigning them to a label and displaying their values?

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### Author: ![p.powercoders1i0t](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@p.powercoders1i0t](https://community.thunkable.com/u/p.powercoders1i0t)
#### Post date: [March 13, 2021, 7:58pm UTC](https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653/3 "2021-03-13T19:58:50Z")

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Thanks for the help @tatiang! To answer your question, the first data source is a local DB.

I checked the values of the three stored variables, they were:

 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/7/7/772d6d08b52a66e778a681942c83eb1dafe9a345.png)  
Yellow = Student name  
Pink = Student Code  
Blue = Profile picture source

But I ended up clearing the local DB and it works fine now! Turns out I had some past stored data in the DB that was formatted incorrectly 😅

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<div class="post-metadata">

### 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: [March 13, 2021, 8:15pm UTC](https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653/4 "2021-03-13T20:15:07Z")

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Glad to hear you got it sorted out!

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### Author: ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)
#### Post date: [November 8, 2024, 1:28pm UTC](https://community.thunkable.com/t/solved-dataviewer-going-blank-typeerror-cannot-read-property-tostring-of-null/1164653/5 "2024-11-08T13:28:49Z")

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