Rojo crashing while using Bat script to install packages

[Sjdinsd]

I made a .bat file that would call the three commands below in order:

wally install
rojo sourcemap -o sourcemap.json
wally-package-types --sourcemap sourcemap.json Packages

This installs/updates packages, updates the sourcemap, and then the wally-package-types crate will update the requires of each package to match any types in the _index module.

The issue I think here is the speed, it crashes maybe with too quick of updates. Below is the error message gotten:

[ERROR rojo] Rojo crashed!
[ERROR rojo] This is probably a Rojo bug.
[ERROR rojo] 
[ERROR rojo] Please consider filing an issue: https://github.com/rojo-rbx/rojo/issues
[ERROR rojo] 
[ERROR rojo] Details: called `Option::unwrap()` on a `None` value
[ERROR rojo] in file src\web\interface.rs on line 44
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

THERE WAS NO LASTING ISSUES
This bug only happens when doing such tasks in quick succession, but restarting fixes this.

Edits:
1: Updated bat file that fixes the crashing by waiting 1 second:

wally install
rojo sourcemap -o sourcemap.json
TIMEOUT /T 1 /NOBREAK
wally-package-types --sourcemap sourcemap.json Packages

2: formatting

[boatbomber]

I think this is because Wally is deleting the Packages directory, so your project json momentarily points to a path that doesn't exist.

edit: nevermind, I misread. The timeout between sourcemap and types fixing it means it's unrelated to the wally install.