Panic on bot.Stop() v4.0.0-beta.4

[ofstudio]

panic: close of closed channel
goroutine 44 [running]:
gopkg.in/telebot%2ev4.(*Webhook).waitForStop(...)
	gopkg.in/[email protected]/webhook.go:161
gopkg.in/telebot%2ev4.(*Webhook).Poll.func1(0xc000450a10)
	gopkg.in/[email protected]/webhook.go:148 +0x2f
created by gopkg.in/telebot%2ev4.(*Webhook).Poll in goroutine 40
	gopkg.in/[email protected]/webhook.go:147 +0x18a

the code

go bot.Start() // 1. Start the bot
<-ctx.Done()   // 2. Wait for context cancel on SIGING or SIGTERM
bot.Stop()     // 3. Stop the bot
// ^^^^ Panic goes here!

[evgeniy-krivenko]

The same error with v3.3.8

 panic: close of closed channel

 goroutine 80 [running]:
 gopkg.in/telebot%2ev3.(*Webhook).waitForStop(...)
  /go/pkg/mod/gopkg.in/[email protected]/webhook.go:155
gopkg.in/telebot%2ev3.(*Webhook).Poll.func1(0xc00007ff80)
  /go/pkg/mod/gopkg.in/[email protected]/webhook.go:142 +0x2f
created by gopkg.in/telebot%2ev3.(*Webhook).Poll in goroutine 59
  /go/pkg/mod/gopkg.in/[email protected]/webhook.go:141 +0x187

[molizz]

1. Use webhook & webhook.ServeHTTP(c.Writer, c.Request) in Gin (http)
2. bot.Start()
3. sleep(1s)
4. bot.Stop() -> panic!!