I am getting a critical error now on the live test on mobile, when before it was working without issue. When I click the button, instead of it completing the action, I get the error screen. On the web, it works just fine. The error showed after I added blocks to the screen for another component. I …

Just a side note that you don’t have to check app variables for null values. That’s only something you need to do for stored variables. You could probably simplify that code quite a bit… But in terms of finding the source of the crash, I’d recommend doing some block-by-block debugging. I have a met…

As for the “null”, I found it during my searches on the site and it worked, so I used it. Lol. What would you suggest to do to simplify it? I’m all for less coding to mess up. I’ll take a look at the debugging info now, thanks :slight_smile:

Sure, I can suggest some improvements. If possible, post a link to your project so I can modify your blocks to show you. Also, what is the purpose of that code? Are you trying to swap background colors?

I’m not sure how to share my project, as it’s private - I’ll try a link. Thunkable Yes, it’s a drop down list, and the selected item changes colour and gets pushed to the button’s text.

I’m not able to open that, possible because it’s a private project. But one change I would make is that when the user clicks an item, you just set the Layout Wrapper’s Background Color to a color value (either via a variable or the Layout Wrapper’s Background Color block). You can probably do that…

I went through the blocks and reduced what was there by getting rid of variables, etc. It works as intended, but there is one new issue. When you click the item in the list, it changes colour, and sends the text to the button. If you click the button again, it now returns the list and the first item…

That looks much better! You’re going to need to loop through all of the rows and set the background color based on whether or not the row is matches the one the user clicked. It’s not the easiest thing to set up and it requires using the Any Component blocks. I’ll see if I can find an example for …

I was able to get the button to work properly by adding a few blocks at the end, but I didn’t use the Any Component blocks. Would this cause problems? Would you mind taking a look at it? The first button works as expected, but the 2nd button, same type of blocks, does not change colour and change th…

I didn’t check the link in that topic but the screenshots should be helpful. If you made changes to your project, you’ll need to post a new link. Each link is a snapshot of the state of that project at the time the link was created.

I did read through the page and screenshots, just thought I’d give a heads-up on the link. I made a copy of the private project page that has the critical error issue on mobile. I don’t have all the components on this screen yet, but it does give the error message when the Strain or Product buttons…

Critical Error - can't find problem

Questions about Thunkable

ioannis June 20, 2023, 6:21pm 16

Hello @kcmahlo
I checked your app
It seems the issue is related to the custom Data viewer layout you are using on the DVLs
I used another Layout and everything worked fine.
Try to do the same and let me know if it helped

1 Like

Topic		Replies	Views
[Solved] While testing on the phone I get error message as something gone wrong Questions about Thunkable beginner	20	820	December 2, 2022
Are my blocks correct? It works but crashes Questions about Thunkable	4	248	September 14, 2023
Have this message when i try to test the app tru the thunkable app Issues / Bugs	4	34	March 29, 2025
Code not appearing or working on the mobile testing app Issues / Bugs beginner	11	221	April 7, 2024
My app when installed isn't working. Please help me Questions about Thunkable	12	322	November 8, 2024

Critical Error - can't find problem

Related topics