panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x20 pc=0x95e2ce]
goroutine 10274 [running]:
github.com/juju/juju/state/watcher.EnsureErr(0x0, 0x0, 0x0, 0x0)
/home/rog/src/go/src/github.com/juju/juju/state/watcher/helpers.go:38 +0x4e
github.com/juju/juju/worker/storageprovisioner.(*storageprovisioner).loop(0xc208465b90, 0x0, 0x0)
/home/rog/src/go/src/github.com/juju/juju/worker/storageprovisioner/storageprovisioner.go:311 +0x10d6
github.com/juju/juju/worker/storageprovisioner.funcĀ·001()
/home/rog/src/go/src/github.com/juju/juju/worker/storageprovisioner/storageprovisioner.go:163 +0x58
created by github.com/juju/juju/worker/storageprovisioner.NewStorageProvisioner
/home/rog/src/go/src/github.com/juju/juju/worker/storageprovisioner/storageprovisioner.go:164 +0x219