sometimes while conversation bot didn't reply for users message, in logs show an error "Error sending outgoing message" and after that error total cost for the message is higher than usual (more than 0,1$)

Looks like you have a card with an empty "Question to ask the user". This is usually found in the capture information card. Make sure its not empty

Yes it's empty, I set raw input and looped the main ai loop, it works 80% of time but after a sometime there occurs an error like this

Why do you want to have an empty raw input card?

I've done bot like chatgpt, there ongoing conversation between user and bot. It's like personal assistant bot, and after every reply user will ask more and more questions, until there will be no questions for bot. And it will be not that good if after every reply bot asks again and again "can I help with anything else"

Have you tried using the "Wait for user input" capture information card.

Thanks for reply, just tried it right now, and there is same error

Can you send a screenshot of the new error message