So far, my experience with Yate script from Webstacks is that it is not at all meant for novices.
The codes are so unstable that just by a simple deletion of a saved user, vehicles or deposit crashes the whole program. Further more, the author does not provide delete function for Admin to safely delete unwanted entries directly from Admin panel. Users is obliged to make modifications directly through PhpMyAdmin. This is not safe at all!

To cope with crash situations, always do a backup of the database and all files and folders to be on the safe side.  Backup everything before undertaking any change. Back it up daily!

One thing for sure about Yate script from Webstacks is to backup database and folders regularly!
Through various trials and errors, I discovered that to recover from catastrophic situation always backup the database before and after bring any changes.

  
Backup will be your best friend in case of failure!
Backup, Backup, Backup, Backup and Backup!