这是咋回事儿？求解

[will0815]

./falcon-agent -check panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x73a64e]

goroutine 1 [running]: github.com/open-falcon/falcon-plus/modules/agent/funcs.DeviceMetrics(0x7f6520, 0xc42010fda0, 0xc42010fca0) /home/falcon/gopath/src/github.com/open-falcon/falcon-plus/modules/agent/funcs/dfstat.go:21 +0xfe github.com/open-falcon/falcon-plus/modules/agent/funcs.CheckCollector() /home/falcon/gopath/src/github.com/open-falcon/falcon-plus/modules/agent/funcs/checker.go:21 +0x1f5 main.main() /home/falcon/gopath/src/github.com/open-falcon/falcon-plus/modules/agent/main.go:27 +0x1d4

[laiwei]

@will0815

https://github.com/open-falcon/falcon-plus/issues/171

https://github.com/open-falcon/falcon-plus/pull/175

[will0815]

ok thx