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[GH-ISSUE #174] NPE after upgrade to 2.8.0 #636

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opened 2026-03-01 17:40:33 +03:00 by kerem · 7 comments

kerem commented

2026-03-01 17:40:33 +03:00

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Originally created by @maybeec on GitHub (Oct 18, 2016).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/174

After upgrading to 2.8.0, I got several NullReferenceExceptions on Calendar sync of the following schema:

System.NullReferenceException: Object reference not set to an instance of an object.
   at CalDavSynchronizer.Implementation.Events.EventEntityMapper.Map2To1(IEvent source, IReadOnlyCollection`1 recurrenceExceptionsOrNull, AppointmentItemWrapper targetWrapper, Boolean isRecurrenceException, IEntityMappingLogger logger)
   at CalDavSynchronizer.Implementation.Events.EventEntityMapper.Map2To1(IICalendar sourceCalendar, AppointmentItemWrapper target, IEntityMappingLogger logger)
   at GenSync.Synchronization.States.RestoreInA`6.<UpdateEntity>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at GenSync.Synchronization.States.RestoreInA`6.JobWrapper.<UpdateEntity>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.Implementation.Events.OutlookEventRepository.<TryUpdate>d__24.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at GenSync.EntityRepositories.BatchEntityRepositoryAdapter`4.<PerformOperations>d__2.MoveNext()

Configuration:

Windows 7 64bit
Outlook 2013
Nextcloud 9.0.53

Originally created by @maybeec on GitHub (Oct 18, 2016). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/174 After upgrading to 2.8.0, I got several NullReferenceExceptions on Calendar sync of the following schema: ``` System.NullReferenceException: Object reference not set to an instance of an object. at CalDavSynchronizer.Implementation.Events.EventEntityMapper.Map2To1(IEvent source, IReadOnlyCollection`1 recurrenceExceptionsOrNull, AppointmentItemWrapper targetWrapper, Boolean isRecurrenceException, IEntityMappingLogger logger) at CalDavSynchronizer.Implementation.Events.EventEntityMapper.Map2To1(IICalendar sourceCalendar, AppointmentItemWrapper target, IEntityMappingLogger logger) at GenSync.Synchronization.States.RestoreInA`6.<UpdateEntity>d__5.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at GenSync.Synchronization.States.RestoreInA`6.JobWrapper.<UpdateEntity>d__9.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.Implementation.Events.OutlookEventRepository.<TryUpdate>d__24.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) at GenSync.EntityRepositories.BatchEntityRepositoryAdapter`4.<PerformOperations>d__2.MoveNext() ``` Configuration: - Windows 7 64bit - Outlook 2013 - Nextcloud 9.0.53

kerem closed this issue

2026-03-01 17:40:33 +03:00

kerem commented

2026-03-01 17:40:34 +03:00

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@aluxnimm commented on GitHub (Oct 18, 2016):

Can you check if it makes any difference when you open and save the sync profile in the options dialog?

@aluxnimm commented on GitHub (Oct 18, 2016): Can you check if it makes any difference when you open and save the sync profile in the options dialog?

kerem commented

2026-03-01 17:40:34 +03:00

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@maybeec commented on GitHub (Oct 18, 2016):

Basically, after doing that and waiting some synchronizations, the issues seems to be gone.
However, I am a little bit afraid as I configured a calendar with Replicate Outlook -> Server and got the following three synchronizations:

what is happening here?

@maybeec commented on GitHub (Oct 18, 2016): Basically, after doing that and waiting some synchronizations, the issues seems to be gone. However, I am a little bit afraid as I configured a calendar with Replicate Outlook -> Server and got the following three synchronizations: ![capture](https://cloud.githubusercontent.com/assets/1427255/19469120/30ef053e-951a-11e6-8852-dde03d15bc5b.PNG) ![capture](https://cloud.githubusercontent.com/assets/1427255/19469135/3f635f66-951a-11e6-9dc6-37c47852fe26.PNG) ![capture](https://cloud.githubusercontent.com/assets/1427255/19469141/4ad56088-951a-11e6-8afd-45781016e9a8.PNG) ![capture](https://cloud.githubusercontent.com/assets/1427255/19469156/56dd0c50-951a-11e6-82ea-5100e752a637.PNG) what is happening here?

kerem commented

2026-03-01 17:40:34 +03:00

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@aluxnimm commented on GitHub (Oct 18, 2016):

Nullreference Exception when options are not saved fixed in 2.8.1

@aluxnimm commented on GitHub (Oct 18, 2016): Nullreference Exception when options are not saved fixed in 2.8.1

kerem commented

2026-03-01 17:40:34 +03:00

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@maybeec commented on GitHub (Oct 18, 2016):

Thanks. But can you explain, why my outlook data got updated regardless of the sync profile replicate?
As stated in the log above.

@maybeec commented on GitHub (Oct 18, 2016): Thanks. But can you explain, why my outlook data got updated regardless of the sync profile replicate? As stated in the log above.

kerem commented

2026-03-01 17:40:34 +03:00

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@aluxnimm commented on GitHub (Oct 18, 2016):

Nope, nothing got updated in Outlook. This info just shows the detected state before syncing (the delta). So we detected, that 3 items in Outlook have been changed since the last sync and nothing was changed on the server side since last sync.

@aluxnimm commented on GitHub (Oct 18, 2016): Nope, nothing got updated in Outlook. This info just shows the detected state before syncing (the delta). So we detected, that 3 items in Outlook have been changed since the last sync and nothing was changed on the server side since last sync.

kerem commented

2026-03-01 17:40:34 +03:00

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@maybeec commented on GitHub (Oct 18, 2016):

👍 thanks. Thus, I miss interpreted the information.
Best support ever!

@maybeec commented on GitHub (Oct 18, 2016): :+1: thanks. Thus, I miss interpreted the information. Best support ever!

kerem commented

2026-03-01 17:40:34 +03:00

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@aluxnimm commented on GitHub (Oct 18, 2016):

You are welcome :)

@aluxnimm commented on GitHub (Oct 18, 2016): You are welcome :)