nyagos panic

.nyagos

nyagos.alias.hoge = function()
    print("fuga")
end

nyagos.on_command_not_found = function(args)
    nyagos.exec("hoge")
    return false
end

error.log

Nihongo Yet Another GOing Shell v150904-386 Powered by go1.5 & Lua 5.3
Copyright (c) 2014,2015 HAYAMA_Kaoru and NYAOS.ORG
[C:/FreeSpace/go/nyagos/nyagos]
$     
fuga
'moge' is not recognized as an internal or external command,
operable program or batch file
[C:/FreeSpace/go/nyagos/nyagos]
$     
************ Panic Occured. ***********
runtime error: invalid memory address or nil pointer dereference
C:/FreeSpace/go/nyagos/nyagos/main/nyagos.go:82 (0x40c02b)
	when_panic: debug.PrintStack()
C:/Tools/godev/src/runtime/asm_386.s:442 (0x458b1a)
	call16: CALLFN(·call16, 16)
C:/Tools/godev/src/runtime/panic.go:423 (0x4353fd)
	gopanic: reflectcall(nil, unsafe.Pointer(d.fn), deferArgs(d), uint32(d.siz), uint32(d.siz))
C:/Tools/godev/src/runtime/panic.go:42 (0x433ed3)
	panicmem: panic(memoryError)
C:/Tools/godev/src/runtime/signal_windows.go:161 (0x444451)
	sigpanic: panicmem()
C:/FreeSpace/go/nyagos/nyagos/main/lua.go:156 (0x4027fb)
	newArgHook: L, Lok := it.Tag.(lua.Lua)
C:/FreeSpace/go/nyagos/nyagos/interpreter/interpreter.go:213 (0x4819d6)
	(*Interpreter).Interpret: state.Argv = argsHook(this, state.Argv)
C:/FreeSpace/go/nyagos/nyagos/main/lua_cmd.go:125 (0x407577)
	cmdExec: errorlevel, err = it.Interpret(statement)
C:/Tools/godev/src/runtime/asm_386.s:442 (0x458b1a)
	call16: CALLFN(·call16, 16)
C:/Tools/godev/src/runtime/cgocall.go:252 (0x412a94)
	cgocallbackg1: reflectcall(nil, unsafe.Pointer(cb.fn), unsafe.Pointer(cb.arg), uint32(cb.argsize), 0)
C:/Tools/godev/src/runtime/cgocall.go:177 (0x412949)
	cgocallbackg: cgocallbackg1()
C:/Tools/godev/src/runtime/asm_386.s:807 (0x45a1fa)
	cgocallback_gofunc: CALL	runtime·cgocallbackg(SB)
C:/Tools/godev/src/runtime/asm_386.s:689 (0x45a16c)
	asmcgocall: CALL	gosave<>(SB)
C:/Tools/godev/src/runtime/cgocall.go:121 (0x412801)
	cgocall: errno := asmcgocall(fn, arg)
C:/Tools/godev/src/runtime/syscall_windows.go:139 (0x44b92a)
	Syscall6: cgocall(asmstdcallAddr, unsafe.Pointer(c))
C:/Tools/godev/src/syscall/dll_windows.go:140 (0x507cfb)
	(*Proc).Call: return Syscall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5])
C:/Tools/godev/src/syscall/dll_windows.go:279 (0x509314)
	(*LazyProc).Call: return p.proc.Call(a...)
C:/FreeSpace/go/nyagos/nyagos/lua/lua.go:255 (0x487a4a)
	Lua.Call: 0)
C:/FreeSpace/go/nyagos/nyagos/main/lua.go:213 (0x402a12)
	on_command_not_found: L.Call(1, 1)
C:/FreeSpace/go/nyagos/nyagos/interpreter/interpreter.go:173 (0x481546)
	(*Interpreter).spawnvp_noerrmsg: return ErrorLevel(255), OnCommandNotFound(this, err)
C:/FreeSpace/go/nyagos/nyagos/interpreter/interpreter.go:188 (0x48170f)
	(*Interpreter).Spawnvp: errorlevel, err := this.spawnvp_noerrmsg()
C:/FreeSpace/go/nyagos/nyagos/interpreter/interpreter.go:266 (0x482343)
	(*Interpreter).Interpret: errorlevel, err = cmd.Spawnvp()
C:/FreeSpace/go/nyagos/nyagos/main/nyagos.go:211 (0x40dcf6)
	main: whatToDo, err := it.Interpret(line)
C:/Tools/godev/src/runtime/proc.go:111 (0x4376a4)
	main: main_main()
C:/Tools/godev/src/runtime/asm_386.s:1662 (0x45a9d1)
	goexit: BYTE	$0x90	// NOP
*** Please copy these error message ***
*** And hit ENTER key to quit.      ***