Hassio ha stop / start

Installation Home Assistant OS
1

Doesnt works hassio ha start / stop

core-ssh:/config# hassio ha start
ERROR
panic: interface conversion: interface is nil, not string

goroutine 1 [running]:
panic(0x2c5f60, 0x107dc1c0)
/home/travis/.gimme/versions/go1.7.6.linux.amd64/src/runtime/panic.go:500 +0x33c
github.com/home-assistant/hassio-cli/command/helpers.DisplayOutput(0x107f0000, 0x24, 0x200, 0x0)
/home/travis/gopath/src/github.com/home-assistant/hassio-cli/command/helpers/common.go:118 +0x3c8
github.com/home-assistant/hassio-cli/command/helpers.ExecCommand(0x2f5e63, 0xd, 0x7ef3fe4b, 0x5, 0x0, 0x0, 0x76000, 0x0, 0x0, 0x0, …)
/home/travis/gopath/src/github.com/home-assistant/hassio-cli/command/helpers/common.go:155 +0x308
github.com/home-assistant/hassio-cli/command.CmdHomeassistant(0x1077a420)
/home/travis/gopath/src/github.com/home-assistant/hassio-cli/command/homeassistant.go:48 +0x540
github.com/urfave/cli.HandleAction(0x2ae6d8, 0x323754, 0x1077a420, 0x0, 0x0)
/home/travis/gopath/src/github.com/urfave/cli/app.go:503 +0xf0
github.com/urfave/cli.Command.Run(0x2f5e63, 0xd, 0x0, 0x0, 0x409d10, 0x1, 0x1, 0x300cfa, 0x2f, 0x0, …)
/home/travis/gopath/src/github.com/urfave/cli/command.go:165 +0x6b8
github.com/urfave/cli.(*App).Run(0x107668c0, 0x1070a140, 0x3, 0x4, 0x0, 0x0)
/home/travis/gopath/src/github.com/urfave/cli/app.go:259 +0x8b0
main.main()
/home/travis/gopath/src/github.com/home-assistant/hassio-cli/main.go:22 +0x108

2

I got that error too.
I removed the System Monitor add and rebooted and it seemed to work.
I seem to recall that the System Monitor needed to be added in a special order, but I cant find that reference now.