Looking forward for reporting a security issue:
Please report security issues by following our security policy: https://contribute.freecodecamp.org/#/security
Describe the bug
When trying to SAVE and you click an empty save slot the following error exception occurs.
To Reproduce
Steps to reproduce the behavior:
Start game
When first presented with how to save your progress click save button in bottom right corner.
Then Save screen appears with empty save slots, click an empty slot.
See error
Expected behavior
Gameplay should be Saved up to this point in time, but gives an error.
Screenshots
If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
OS: Windows 11
Browser: EDGE
Version: 108.0.1462.54 (Official build) (64-bit)
Additional context
Add any other context about the problem here.
I was using the APP via the downloaded ZIP file on windows 11, not via a web browser or smartphone.
Voidcutter
commented
1 year ago 
RuolinZheng08
Looking forward for reporting a security issue: Please report security issues by following our security policy:
https://contribute.freecodecamp.org/#/securityDescribe the bug When trying to SAVE and you click an empty save slot the following error exception occurs. To Reproduce Steps to reproduce the behavior:
Expected behavior Gameplay should be Saved up to this point in time, but gives an error.
Screenshots If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
Additional context Add any other context about the problem here.
I was using the APP via the downloaded ZIP file on windows 11, not via a web browser or smartphone.