error in Telegram notification

I am trying to make a Telegram notification when the user is log out or log in
I fill this data in fields:
1-Send alert on:(‘new’ or ‘save’)
2-DocumentType(‘Activity Log’)

When I enable this alert and save when the user press log out Error message showing
Error message(‘can only concatenate str (not “int”) to str’)
I will attach picture for error message and picture for Notification Screen

Note(I used the notification when the user submit the sale invoice and it is work good and the message sent to telegram )
please guide me .thanks