ExchangeToMimeConverter Error

When using our Exchange Account we get this error everytime when checking for new mail.

11:50:32 [email protected][IMAP]  Synchronisiere Unterordner: Fertig
11:50:34   System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
11:50:34    bei MailClient.Protocols.Exchange.ExchangeToMimeConverter.ConvertEmailAddress(EmailAddress address)
11:50:34    bei MailClient.Protocols.Exchange.ExchangeToMimeConverter.<>c.b__11_0(EmailAddress
a)

11:50:34 bei System.Linq.Enumerable.<>c __DisplayClass13_02.<select>b__ 0(TSource item, Int32 i)<br alt="" name="" rel="" target="" title="" type="" value=""> 11:50:34 bei System.Linq.Enumerable.<selectyield>d__152.MoveNext()

11:50:34 bei
System.Linq.Enumerable.d__121.MoveNext()<br alt="" name="" rel="" target="" title="" type="" value=""> 11:50:34 bei System.Collections.Generic.List1…ctor(IEnumerable1 collection)<br alt="" name="" rel="" target="" title="" type="" value=""> 11:50:34 bei System.Linq.Enumerable.ToList[TSource](IEnumerable1
source)

11:50:34 bei
MailClient.Protocols.Exchange.ExchangeToMimeConverter.ConvertEmailAddresses(EmailAddressCollection
addresses)

11:50:34 bei MailClient.Protocols.Exchange.ExchangeToMimeConverter.CreateEnvelope(EmailMessage
message)

11:50:34 bei
MailClient.Protocols.Exchange.ExchangeMailSynchronizer.d__12.MoveNext()

11:50:34 bei System.Collections.Generic.List1.InsertRange(Int32 index, IEnumerable1 collection)

11:50:34 bei
MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.ConvertApplicationDataAndSkipUnparsable(ExchangeService service, Item item, CancellationToken cancellationToken)<br alt="" name="" rel="" target="" title="" type="" value=""> 11:50:34 bei MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.d__18.MoveNext()

11:50:34 bei
System.Linq.Enumerable.d__203.MoveNext()<br alt="" name="" rel="" target="" title="" type="" value=""> 11:50:34 bei System.Linq.Enumerable.<selectyield>d__152.MoveNext()

11:50:34 bei MailClient.Protocols.Common.ItemSynchronizeContext2.StoreItems(SynchronizationType synchronizationType, IEnumerable1 newItems)

11:50:34 bei
MailClient.Protocols.Common.MailItemSynchronizeContext.StoreItems(SynchronizationType
synchronizationType, IEnumerable1 newItems)<br alt="" name="" rel="" target="" title="" type="" value=""> 11:50:34 bei MailClient.Protocols.Common.ItemSynchronizeContext2.Synchronize[T](SynchronizationType
synchronizationType, IEnumerable1 items, Func2 getUniqueId, Func3 hasChanged, Func2 isDeleted, Func2 convertItems, Action2 updateItem)

11:50:34 bei
MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.Synchronize(IItemSynchronizeContext1
synchronizeContext, Folder folder, CancellationToken cancellationToken)

11:50:34 bei
MailClient.Protocols.Common.ItemSynchronizer`2.<>c DisplayClass32_0.b 1(WorkerStatus
status, CancellationToken cancellationToken)

11:50:34 bei
MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus
status)

11:50:34 bei MailClient.Commands.Command.Process(WorkerStatus
status)

I think the best option is for you to open a support ticket with eM Client as it is unlikely that any users on this forum will be able to assist you with this Exchange issue.