Writing encrypted output to same file causes crash

[christhegrand]

I have a secrets YML file I want to encrypt. If I run this encryption command from the command line, sops prints out the encrypted data successfully:

Chriss-MacBook-Pro:Backend GOOGLE_APPLICATION_CREDENTIALS=Deploy/Terraform/stage/xxx-Staging.json sops --encrypt --gcp-kms projects/xxx-staging/locations/us-west1/keyRings/xxx-key-ring/cryptoKeys/xxx-crypto-key 

If I run this instead and try to write the encrypted version of the data back to the same file, this error occurs:

Chriss-MacBook-Pro:Backend GOOGLE_APPLICATION_CREDENTIALS=Deploy/Terraform/stage/xxx-Staging.json sops --encrypt --gcp-kms projects/xxx-staging/locations/us-west1/keyRings/xxx-key-ring/cryptoKeys/xxx-crypto-key Deploy/Kubernetes/secrets/stage.enc.yml > Deploy/Kubernetes/secrets/stage.enc.yml
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
main.encrypt({{0x1c2afd0, 0xc0004f9410}, {0xa4652d8, 0x225d1e0}, {0xa4652d8, 0x225d1e0}, {0xc000160640, 0x47}, {0xc00043d000, 0x1, ...}, ...})
        /private/tmp/sops-20220311-22333-2wflpl/sops-3.7.2/cmd/sops/encrypt.go:68 +0x634
main.main.func8(0xc00018ef20)
        /private/tmp/sops-20220311-22333-2wflpl/sops-3.7.2/cmd/sops/main.go:788 +0xa38
gopkg.in/urfave/cli%2ev1.HandleAction({0x190c3a0, 0x1aa8f70}, 0x27)
        /Users/brew/Library/Caches/Homebrew/go_mod_cache/pkg/mod/gopkg.in/urfave/[email protected]/app.go:490 +0x5a
gopkg.in/urfave/cli%2ev1.(*App).Run(0xc0003d16c0, {0xc000136000, 0x5, 0x5})
        /Users/brew/Library/Caches/Homebrew/go_mod_cache/pkg/mod/gopkg.in/urfave/[email protected]/app.go:264 +0x5e6
main.main()
        /private/tmp/sops-20220311-22333-2wflpl/sops-3.7.2/cmd/sops/main.go:987 +0x3699

Writing to a different file works successfully:

GOOGLE_APPLICATION_CREDENTIALS=Deploy/Terraform/stage/xxx-Staging.json sops --encrypt --gcp-kms projects/xxx-staging/locations/us-west1/keyRings/xxx-key-ring/cryptoKeys/xxx-crypto-key Deploy/Kubernetes/secrets/stage.enc.yml > Deploy/Kubernetes/secrets/stage.yml

I am on sops version 3.7.2 on MacOS 11.6.