Things crashes

[garukun]

2016/10/27 16:19:38 http: panic serving 10.20.109.0:3874: runtime error: invalid memory address or nil pointer dereference
goroutine 18 [running]:
net/http.(*conn).serve.func1(0xc4203a2180)
    /usr/local/go/src/net/http/server.go:1491 +0x12a
panic(0x76ff60, 0xc420018030)
    /usr/local/go/src/runtime/panic.go:458 +0x243
github.com/garukun/golgtm/pkg/lgtm/internal/adapters.(*IssueComment).validate(0xc42038c430, 0xc42039f1d0, 0xc42039f1d0, 0x0)
    /go/src/github.com/garukun/golgtm/pkg/lgtm/internal/adapters/issuecoment.go:64 +0x2a
github.com/garukun/golgtm/pkg/lgtm/internal/adapters.(*IssueComment).Adapt.func1(0x984660, 0xc4203c4820, 0xc4203ba0f0)
    /go/src/github.com/garukun/golgtm/pkg/lgtm/internal/adapters/issuecoment.go:34 +0x2c8
net/http.HandlerFunc.ServeHTTP(0xc4203ae130, 0x984660, 0xc4203c4820, 0xc4203ba0f0)
    /usr/local/go/src/net/http/server.go:1726 +0x44
github.com/garukun/golgtm/pkg/lgtm/internal/adapters.(*EventRouter).Adapt.func1(0x984660, 0xc4203c4820, 0xc4203ba0f0)
    /go/src/github.com/garukun/golgtm/pkg/lgtm/internal/adapters/eventrouter.go:27 +0x245
net/http.HandlerFunc.ServeHTTP(0xc420387800, 0x984660, 0xc4203c4820, 0xc4203ba0f0)
    /usr/local/go/src/net/http/server.go:1726 +0x44
github.com/garukun/golgtm/pkg/lgtm.(*LGTM).ServeHTTP(0xc4200fb080, 0x984660, 0xc4203c4820, 0xc4203ba0f0)
    /go/src/github.com/garukun/golgtm/pkg/lgtm/lgtm.go:42 +0x51
net/http.serverHandler.ServeHTTP(0xc42028b800, 0x984660, 0xc4203c4820, 0xc4203ba0f0)
    /usr/local/go/src/net/http/server.go:2202 +0x7d
net/http.(*conn).serve(0xc4203a2180, 0x984de0, 0xc42039b280)
    /usr/local/go/src/net/http/server.go:1579 +0x4b7
created by net/http.(*Server).Serve
    /usr/local/go/src/net/http/server.go:2293 +0x44d