We released new version 7.2.8 of Bopup Messenger client for secure and private messaging. This update fixes critical error that may occur during file transfer process. The issue happens when a sender sends files and close the transfer dialog before reciepient accepts incoming data. In this case sender's messenger crashes with an error.
This problem does not affect when files are sent to multiple users, delivered as offline transfer to keep the files on the server and when immediate file transfer is set on the server when senders do not wait for recipient's response.
Anyway we recommend to update existing messenger app to avoid possible issues in the future.