Backslashes in custom commands not escaped in JSON

[Zguy]

I have a project with a custom command that contains backslashes.
When I save the project, the command is saved unescaped in the JSON file

"customCommands": [{ "command": "out\build\x64-Debug\bin\App.exe", "when": "Manual" }],

This is not valid JSON.

When I try to open the project, I get the following error

Cannot read properties of null (reading 'externalLevels') (TypeError)

Which is an incredibly misleading error. externalLevels is nowhere close to customCommands physically within the JSON file.

If I manually escape the backslashes in the custom command with a text editor I can open the project again, but every time I save it's saved unescaped again.

[deepnight]

Thanks for reporting this bug!

[deepnight]

Fixed in 1.4