Urgent Issue - Botman is stuck in a loop in a conversation class

I have implemented Botman web widget in a php project which is hosted in **siteground**. Here I have implemented question-answer conversation by generating **Button**. Sometimes its working properly but maximum time it goes to a infinite loop.

My server PHP version is same as my local-server ie **7.1.33** (mentioned in the documentation) but it not working in live server properly. I have already live the website; so please guide me how can I solve this issue.

If is there any server related requirement needed for this application then please tell me but its really an urgent issue. If you want then can provide you the respected link also. Here I have attached my chat.php & OnboardConversation.php file code.

[chat-php.txt](https://github.com/botman/web-widget/files/3829792/chat-php.txt)
[OnboardConversation-php.txt](https://github.com/botman/web-widget/files/3829793/OnboardConversation-php.txt)

Thank you