When restoring a SQL database, the plugin will crash and produce a dump file where NetVault Backup is installed on the SQL server in the NetVault Backup\dump folder. The dump file will show the crash was dued to assert(llEndPos >= llStartPos).
Job Message 2014/09/16 14:54:35 191 Data Plugin NVBUSERVER Restoring copy-only backup of database 'PROD1'
Error 2014/09/16 14:54:36 191 Jobs CLIENT1 Job manager lost message channel unexpectedly
Error 2014/09/16 14:54:36 191 Jobs CLIENT1 Job Status: Restore Failed
The problem is that there is a problem with the SQL database and the size of the database in the backup is 0. There is nothing to restore from the backup for this database.
Bug 27402 has been created to handle this scenario gracefully and produce a log message. In the backup, there will be a warning or error message added to let you know there is a problem with the database.