Need quick help fixing game host upload — more work after

Good day

I understand the task, I need to help correctly upload the game to Vercel, reproduce and fix the error "JSON Parse error: Unexpected identifier 'undefined'", which appears only on some devices, and ensure that the game runs stably afterwards.

How I see the work
1. Setting up the project and deployment on Vercel
1.1 I will check the project structure, build scripts, environment
1.2 I will set up deployment on Vercel, check routing, paths to assets, environment variables

… 2. Finding the cause of the JSON error
2.1 I will pinpoint the location where JSON.parse is called and add temporary logging to see what exactly is coming as undefined
2.2 I will check the differences across devices and browsers, mobile Safari, Chrome, desktop, to reproduce the bug
2.3 I will check data sources, localStorage, fetch to the backend, static files, to rule out different response formats

3. Fixing
3.1 I will add safe parsing, checks for undefined and incorrect data
3.2 If necessary, I will adjust the data format from the server or the logic of saving in localStorage, so that valid JSON is received on all devices
3.3 I will remove temporary logs and tidy up the code

4. Testing
4.1 I will run the main game scenario on several devices and browsers until the error appears
4.2 After the fix, I will check that there are no pop-up errors, the game does not crash, and data is read correctly
4.3 I will prepare a short report on what exactly was the cause and what changes were made

Deadline and cost:
1. The assessment and fix of the specific error along with the deployment setup on Vercel usually takes 4-8 working hours
2. The budget is around $80-150, if it turns out that the problem is deeper (for example, if a significant rewrite of the data storage logic is needed), we will agree on a new ceiling before starting the revisions

To estimate more accurately and start right away:
1. What stack is the game made on, pure JS, React, Phaser, or something else?
2. Is there a repository on GitHub or GitLab, or do we need to work from a project archive?
3. Does the error appear immediately upon entering the game or after a specific action, bet, resource loading?
4. Is a separate test project on Vercel needed, or will we fix the currently functioning one?

I am ready to get involved, analyze the project, set up deployment on Vercel, and bring the game to a stable launch without errors.

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Good night. Write - I will do it now.

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