TypeError: Cannot read properties of null (reading 'toXML')

ten_6044 · June 3, 2024, 4:17am

Steps

Drag and drop the following blocks to the Snap! editor to import the following blocks:
Run that script.
Try to export the project.
The error (TypeError: Cannot read properties of null (reading 'toXML')) appears.

I don't know how this exactly happened, but if a bug can be fixed, this could be, too.

avi_shor · June 3, 2024, 4:20am

what r u tryting to make

ten_6044 · June 3, 2024, 4:20am

I'm trying to make a converter project. When I have done the project and try to save it, it got stuck. Exporting it yields the error.

calculator · June 3, 2024, 4:20am

Huh, strange, exporting worked fine for me.
(Running on ChromeOS on a Chromebook)

avi_shor · June 3, 2024, 4:22am

?wym

ten_6044 · June 3, 2024, 4:22am

I guess you need to run the script first before exporting. Looks like that I get the error.

I'm on an HP laptop on Windows 11.

It's a project that allows to convert units to other units, and even create your own converters. It'll be released soon.

calculator · June 3, 2024, 4:27am

Thats what I did, but exporting still worked fine. It could potentially be a Windows issue..
I do have a Windows 11 computer I could try exporting it on here in a bit

bh · June 3, 2024, 5:05am

Works for me (MacOS, Chrome).

ten_6044 · June 3, 2024, 5:09am

Can no longer reproduce now. Weird.

mehone · June 3, 2024, 5:19am

send link

ego-lay_atman-bay · June 3, 2024, 5:31am

I can reproduce it like this.

Import the script into snap
Create a variable named a (a global or local variable, one's content that would be saved in the project)
Run the script
Try to export the project

mehone · June 3, 2024, 10:19am

did you send the project yet?

ten_6044 · June 3, 2024, 10:36am

The project is WIP (work in progress). The bug blocks sharing somehow unless the bug is fixed.

dardoro · June 3, 2024, 11:45am

@OP, you may mark the variable "a" as "transient" to be able to save/export.

Minimal reproducible example ( "say for" is "required" to trigger the error)
test script pic

Edit: minimal example

JS Console after save/export.

gui.js?version=2024-04-24:5743 Uncaught TypeError: Cannot read properties of null (reading 'toXML')
    at store.js?version=2023-07-27:2530:46
    at Array.reduce (<anonymous>)
    at Context.toXML (store.js?version=2023-07-27:2529:21)
    at XML_Serializer.store (store.js?version=2023-07-27:128:19)
    at Context.toXML (store.js?version=2023-07-27:2544:40)
    at XML_Serializer.store (store.js?version=2023-07-27:128:19)
    at store.js?version=2023-07-27:2133:46
    at Array.reduce (<anonymous>)
    at VariableFrame.toXML (store.js?version=2023-07-27:2110:35)
    at XML_Serializer.store (store.js?version=2023-07-27:128:19)

mehone · June 3, 2024, 12:12pm

i need the project to see the bug

i cant replicate the formula block

ten_6044 · June 3, 2024, 12:14pm

See @dardoro's post:

mehone · June 3, 2024, 12:16pm

i already saw the post