Error index out of range

[linh060]

Hi There,
Thanks for your exporter, it's very useful for me.
But I met an error as below:

2021/10/13 06:33:39 http: panic serving 10.29.81.43:41332: runtime error: index out of range goroutine 1356 [running]: net/http.(*conn).serve.func1(0xc00033a000) /home/phuslu/go.git/src/net/http/server.go:1754 +0xd0 panic(0x8b2ee0, 0xd0f820) /home/phuslu/go.git/src/runtime/panic.go:513 +0x1b9 main.(*Metrics).CollectFilesystem(0xc0004e8090, 0x0, 0x0) /home/phuslu/remote_node_exporter/remote_node_exporter.go:875 +0x18f7 main.(*Metrics).CollectAll(0xc0004e8090, 0xc0004e8090, 0x72, 0x0, 0x0) /home/phuslu/remote_node_exporter/remote_node_exporter.go:976 +0x178 main.main.func1(0x9c8020, 0xc0001c4000, 0xc0004e4000) /home/phuslu/remote_node_exporter/remote_node_exporter.go:1199 +0x7e net/http.HandlerFunc.ServeHTTP(0xc0000856e0, 0x9c8020, 0xc0001c4000, 0xc0004e4000) /home/phuslu/go.git/src/net/http/server.go:1972 +0x44 net/http.(*ServeMux).ServeHTTP(0xd1d840, 0x9c8020, 0xc0001c4000, 0xc0004e4000) /home/phuslu/go.git/src/net/http/server.go:2369 +0x127 net/http.serverHandler.ServeHTTP(0xc0001a21a0, 0x9c8020, 0xc0001c4000, 0xc0004e4000) /home/phuslu/go.git/src/net/http/server.go:2749 +0xab net/http.(*conn).serve(0xc00033a000, 0x9c88e0, 0xc000192080) /home/phuslu/go.git/src/net/http/server.go:1855 +0x646 created by net/http.(*Server).Serve /home/phuslu/go.git/src/net/http/server.go:2859 +0x2f5

Please kindly help me to fix it.
Thank You so much!