Better error message when the app isn't installed to the repo

[CatChen]

The error message Error: Cannot read properties of undefined (reading 'id') isn't very descriptive. I looked into this action's source code and realized that the app wasn't properly installed to the repo so this line throws:

action-github-app-token/src/main.ts

Line 25 in 86b9938

let installationId = installations.data[0].id;

[ChrisAcrobat]

I think I have this issue currently. Do you know how to fix it?
I had it working on an older repo, but I get this error on a new repo after copy-pasting the workflow.
EDIT: Fixed it. Thanks for pointing me to the right direction.