panic with parseNicstatOutput

I'm using version 20180708.smartos-x86_64. The exporter start fine but querying the /metrics endpoint causes a panic with the following trace:

: ./smartos_exporter-20180708.smartos-x86_64
INFO[0000] Starting smartos_exporter (version=, branch=, revision=)  source="main.go:63"
INFO[0000] Listening on :9100                            source="main.go:101"
ERRO[0002] error on executing nicstat: exit status 1     source="nicstat.go:58"
panic: runtime error: slice bounds out of range

goroutine 54 [running]:
github.com/virtua-network/smartos_exporter/collector.(*GZMLAGUsageCollector).parseNicstatOutput(0xc42001ee70, 0x0, 0x0, 0x200, 0x0)
        /root/go/src/github.com/virtua-network/smartos_exporter/collector/nicstat.go:69 +0x41a
github.com/virtua-network/smartos_exporter/collector.(*GZMLAGUsageCollector).nicstat(0xc42001ee70)
        /root/go/src/github.com/virtua-network/smartos_exporter/collector/nicstat.go:60 +0x15b
github.com/virtua-network/smartos_exporter/collector.(*GZMLAGUsageCollector).Collect(0xc42001ee70, 0xc420030960)
        /root/go/src/github.com/virtua-network/smartos_exporter/collector/nicstat.go:48 +0x2b
github.com/prometheus/client_golang/prometheus.(*Registry).Gather.func1()
        /root/go/src/github.com/prometheus/client_golang/prometheus/registry.go:401 +0x5c
created by github.com/prometheus/client_golang/prometheus.(*Registry).Gather
        /root/go/src/github.com/prometheus/client_golang/prometheus/registry.go:454 +0x816

Some system info:

{
  "Live Image": "20180913T002056Z",
  "System Type": "SunOS",
  "Boot Time": "1537893096",
  "SDC Version": "7.0",
  "Manufacturer": "HP",
  "Product": "ProLiant DL380 G7",
[...]
  "CPU Type": "Intel(R) Xeon(R) CPU E5645 @ 2.40GHz",
  "CPU Virtualization": "vmx",
  "CPU Physical Cores": 2,
[...]
  "CPU Total Cores": 12,
  "MiB of Memory": "73717",
[...]
  "Network Interfaces": {
    "bnx2": {"MAC Address": "[...]", "ip4addr": "[...]", "Link Status": "up", "NIC Names": ["admin"]},
    "bnx0": {"MAC Address": "[...]", "ip4addr": "", "Link Status": "down", "NIC Names": []},
    "bnx1": {"MAC Address": "[...]", "ip4addr": "", "Link Status": "down", "NIC Names": []},
    "bnx3": {"MAC Address": "[...]", "ip4addr": "", "Link Status": "up", "NIC Names": ["backbone"]}
  },
  "Virtual Network Interfaces": {
    "backbone0": {"MAC Address": "[...]", "ip4addr": "[...]", "Link Status": "up", "Host Interface": "bnx3", "VLAN": "0"}
  },
  "Link Aggregations": {
  }
}

virtua-network / smartos_exporter

panic with parseNicstatOutput #26