panic: runtime error: invalid memory address or nil pointer dereference

[patsevanton]

Hello! I try run vault-backup and get error:

vault-backup -base64 -filename my-vault.backup
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x8a4700]

goroutine 1 [running]:
main.(*VaultBackup).walk(0xc0003002a0, {0x0, 0x0}, {0xc0003045f0, 0x1, 0x9c0391})
	/home/runner/work/vault-backup/vault-backup/main.go:87 +0x500
main.main()
	/home/runner/work/vault-backup/vault-backup/main.go:189 +0x305