fatal error: concurrent map writes

[zcjl]

go version

go version go1.7 darwin/amd64

go env

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/zcjl/GoDemo"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"

when i start golangdoc with:
golangdoc -http=:6060 -lang=zh_CN

it breaked down with error log:

fatal error: concurrent map writes

goroutine 405 [running]:
runtime.throw(0x649f72, 0x15)
/usr/local/go/src/runtime/panic.go:566 +0x95 fp=0xc420565910 sp=0xc4205658f0
runtime.mapassign1(0x597e00, 0xc42015ab40, 0xc420565b18, 0xc420144550)
/usr/local/go/src/runtime/hashmap.go:458 +0x8ef fp=0xc4205659f8 sp=0xc420565910
github.com/golang-china/golangdoc/local.initDocTable(0x7fff5fbff8f4, 0x5, 0xc420144540)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/local/local.go:166 +0xd3 fp=0xc420565ba8 sp=0xc4205659f8
github.com/golang-china/golangdoc/local.RegisterPackage(0x7fff5fbff8f4, 0x5, 0xc420144540)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/local/local.go:63 +0xd5 fp=0xc420565c10 sp=0xc420565ba8
github.com/golang-china/golangdoc/local.(_localTranslater).Package(0x986128, 0x7fff5fbff8f4, 0x5, 0xc420010485, 0xc, 0x0, 0x0, 0x0, 0xc4203e2518)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/local/local_translater.go:48 +0xc4 fp=0xc420565c60 sp=0xc420565c10
github.com/golang-china/golangdoc/local.Package(0x7fff5fbff8f4, 0x5, 0xc420010485, 0xc, 0x0, 0x0, 0x0, 0xc420010280)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/local/local.go:137 +0x1c5 fp=0xc420565cd0 sp=0xc420565c60
main.runGodoc.func1(0xc420010485, 0xc, 0x0, 0x0, 0x0, 0xc4203e25b8, 0x4ee31, 0x11)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/main.go:199 +0xb7 fp=0xc420565d30 sp=0xc420565cd0
github.com/golang-china/golangdoc/godoc.(_treeBuilder).newDirTree(0xc4201465d0, 0xc42014a2c0, 0xc420010480, 0x11, 0xc4200cfc77, 0x7, 0x3, 0x0)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/godoc/dirtrees.go:80 +0x11e fp=0xc420565ed8 sp=0xc420565d30
github.com/golang-china/golangdoc/godoc.(_treeBuilder).newDirTree.func1(0xc420519380, 0xc4201465d0, 0xc42014a2c0, 0xc4205a2660, 0x9, 0x2, 0x947740, 0xc4206a7ad0)
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/godoc/dirtrees.go:100 +0x110 fp=0xc420565f60 sp=0xc420565ed8
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc420565f68 sp=0xc420565f60
created by github.com/golang-china/golangdoc/godoc.(_treeBuilder).newDirTree
/Users/zcjl/GoDemo/src/github.com/golang-china/golangdoc/godoc/dirtrees.go:101 +0x64b