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Error "Object reference not set to an instance of an object" during mailbox backup with Veeam Backup for Microsoft Office 365

Challenge

Mailbox backup may fail with error:
"Processing mailbox %mailbox@name.com% failed with error: Object reference not set to an instance of an object."

You will also find these entries in "C:\ProgramData\Veeam\Backup365\Logs\Veeam.Archiver.Service_%date_time%.log" log:
Processing mailbox: mailbox@name.com...
Syncing folder items: name...
Sync time: 0.562066
Changed items: 26, deleted items: 0
Estimated changed items size: 1.77 MB
Error: Object reference not set to an instance of an object.
Stack:
   at Veeam.Archiver.Source.SyncPage.SaveChanges(IFolderRepository repository)
   at Veeam.Archiver.Source.ItemProcessor.ProcessFolder(Byte[] id, ExFolder folder, Byte[] currentState)
   at Veeam.Archiver.Source.ItemProcessor.<>c__DisplayClass6_0.<Process>b__0()
   at Veeam.Archiver.Source.FolderRetry.<>c__DisplayClass14_0`1.<Process>b__0()
   at Veeam.Archiver.Source.FolderRetry.Process(Action action)
   at Veeam.Archiver.Source.FolderRetry.Process[T](Func`1 func)
   at Veeam.Archiver.Source.ItemProcessor.Process(ExFolder folder)
   at Veeam.Archiver.Source.FolderProcessor.DoMailboxWork(CancellationToken cancel)
   at Veeam.Archiver.Source.MailboxAction.DoWork(CancellationToken cancel)
Mailbox processing failed: mailbox@name.com

Solution

If you running version 1.0.0.860 or older, the issue has been resolved in Veeam Backup for Microsoft Office 365 1.0 Update 1.
If you running version 1.0.0.912 or newer, contact Veeam support directly to obtain the fix.

KB ID:
2217
Product:
Veeam Backup for Microsoft Office 365
Version:
1.0.0.860
Published:
2017-01-06
Last Modified:
2020-08-13
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