missing stack trace in case of panic about fasthttprouter HOT 5 CLOSED

		callers := make([]uintptr, 10)
		num := runtime.Callers(0, callers)
		frames := runtime.CallersFrames(callers)

		var (
			frame runtime.Frame
			more bool
		)
		for {
			frame, more = frames.Next();
			fmt.Println(frame.File, frame.Line)
			num--
			if !more || num <= 0 {
				break
			}
		}

func apiServerPanic(ctx *fasthttp.RequestCtx, rcv interface{}) {
	log.Printf("server panic: %+v\n%s", rcv, debug.Stack())
	msg := fmt.Sprintf("server painc: %v\n", rcv)
	ctx.Write([]byte(msg))
	ctx.Write(debug.Stack())
	ctx.SetStatusCode(500)
	return
}

...
router.PanicHandler = apiServerPanic

server painc: runtime error: index out of range
goroutine 6 [running]:
runtime/debug.Stack(0xc420184000, 0xc420016420, 0x30)
	/usr/local/opt/go/libexec/src/runtime/debug/stack.go:24 +0x79
bdn/server.apiServerPanic(0xc420184000, 0x2d0420, 0xc4200140f0)
	/Users/zippo/develop/go/src/bdn/server/server.go:73 +0x1cd
github.com/buaazp/fasthttprouter.(*Router).recv(0xc4201568d0, 0xc420184000)
	/Users/zippo/develop/go/src/github.com/buaazp/fasthttprouter/router.go:236 +0x5b
panic(0x2d0420, 0xc4200140f0)
	/usr/local/opt/go/libexec/src/runtime/panic.go:458 +0x243
bdn/util.FastItWorks(0xc420184000)
	/Users/zippo/develop/go/src/bdn/util/http.go:233 +0x14
github.com/buaazp/fasthttprouter.(*Router).Handler(0xc4201568d0, 0xc420184000)
	/Users/zippo/develop/go/src/github.com/buaazp/fasthttprouter/router.go:300 +0xad5
bdn/util.FastLogger.func1(0xc420184000)
	/Users/zippo/develop/go/src/bdn/util/logger.go:30 +0x20b
github.com/valyala/fasthttp.(*Server).serveConn(0xc420067d40, 0x48c260, 0xc42002e010, 0x1, 0x101)
	/Users/zippo/develop/go/src/github.com/valyala/fasthttp/server.go:1533 +0x573
github.com/valyala/fasthttp.(*Server).(github.com/valyala/fasthttp.serveConn)-fm(0x48c260, 0xc42002e010, 0xc42002bf58, 0x1)
	/Users/zippo/develop/go/src/github.com/valyala/fasthttp/server.go:1250 +0x3e
github.com/valyala/fasthttp.(*workerPool).workerFunc(0xc420170080, 0xc42000c400)
	/Users/zippo/develop/go/src/github.com/valyala/fasthttp/workerpool.go:210 +0xde
github.com/valyala/fasthttp.(*workerPool).getCh.func1(0xc420170080, 0xc42000c400, 0x2aa4a0, 0xc42000c400)
	/Users/zippo/develop/go/src/github.com/valyala/fasthttp/workerpool.go:182 +0x35
created by github.com/valyala/fasthttp.(*workerPool).getCh
	/Users/zippo/develop/go/src/github.com/valyala/fasthttp/workerpool.go:184 +0x111

runtime/debug.Stack(0x42e660, 0x2f, 0x0)
	/usr/local/go/src/runtime/debug/stack.go:24 +0x79
bitbucket.org/externalproject/session-service/routes.glob..func1(0xc42011ed80, 0x6ffe60, 0xc42000c130)
	/home/project/go/src/github.com/project/myproject/_libs/src/bitbucket.org/externalproject/session-service/routes/route_manager.go:22 +0x34
github.com/buaazp/fasthttprouter.(*Router).recv(0xc420170270, 0xc42011ed80)
	/home/project/go/src/github.com/project/myproject/_libs/src/github.com/buaazp/fasthttprouter/router.go:236 +0x5b
panic(0x6ffe60, 0xc42000c130)
	/usr/local/go/src/runtime/panic.go:458 +0x243
github.com/valyala/fasthttp.(*RequestCtx).SetUserValue(0x0, 0x76dcd7, 0x2, 0x6e87e0, 0xc420149650)
	/home/project/go/src/github.com/project/myproject/_libs/src/github.com/valyala/fasthttp/server.go:461 +0x22
github.com/buaazp/fasthttprouter.(*node).getValue(0xc420015680, 0xc420013127, 0xb, 0x0, 0xc4200feb20, 0x7300000000)
	/home/project/go/src/github.com/project/myproject/_libs/src/github.com/buaazp/fasthttprouter/tree.go:364 +0x1c7
github.com/buaazp/fasthttprouter.(*Router).allowed(0xc420170270, 0xc420013100, 0x32, 0xc42003fc48, 0x3, 0x25, 0x33)
	/home/project/go/src/github.com/project/myproject/_libs/src/github.com/buaazp/fasthttprouter/router.go:273 +0x13d
github.com/buaazp/fasthttprouter.(*Router).Handler(0xc420170270, 0xc42011ed80)
	/home/project/go/src/github.com/project/myproject/_libs/src/github.com/buaazp/fasthttprouter/router.go:353 +0x23e
github.com/buaazp/fasthttprouter.(*Router).Handler-fm(0xc42011ed80)

bitbucket.org/externalproject/session-service/routes.glob..func1(0xc42011ed80, 0x6ffe60, 0xc42000c130)
	/home/project/go/src/github.com/project/myproject/_libs/src/bitbucket.org/externalproject/session-service/routes/route_manager.go:22 +0x34