Dotmim.Sync.SyncException: Error reading JObject from JsonReader

This is appearing in our logs from time to time. Dotmim.Sync.SyncException: Error reading JObject from JsonReader. Path '', line 0, position 0.

Once this appears for a user, it reappears repeatedly. The full strack trace

Dotmim.Sync.SyncAgent.<>c__DisplayClass53_0
<<SynchronizeAsync>b__0>d.MoveNext$catch$1 ()
System.Runtime.ExceptionServices
ExceptionDispatchInfo.Throw ()
System.Runtime.CompilerServices
TaskAwaiter.ThrowForNonSuccess (Task)
System.Runtime.CompilerServices
TaskAwaiter.HandleNonSuccessAndDebuggerNotification (Task)
System.Runtime.CompilerServices
TaskAwaiter.ValidateEnd (Task)
System.Runtime.CompilerServices
TaskAwaiter.GetResult ()
Dotmim.Sync.SyncAgent
<SynchronizeAsync>d__53.MoveNext ()
System.Runtime.ExceptionServices
ExceptionDispatchInfo.Throw ()
System.Runtime.CompilerServices
TaskAwaiter.ThrowForNonSuccess (Task)
System.Runtime.CompilerServices
TaskAwaiter.HandleNonSuccessAndDebuggerNotification (Task)
System.Runtime.CompilerServices
TaskAwaiter.ValidateEnd (Task)
Wbl.Services.DataService
<SyncAsync>d__44.MoveNext ()

We’ve had a report from one company impacted with this issue, that their machines have not been able to sync to each other for a few days. All their data appears to have synced to the server, but we can’t be sure.

Should we handle this exception in some way other than just logging it?

We have on the client

Dotmim.Sync.Sqlite 0.9.1
Dotmim.Sync.Web.Client 0.9.1

on the server

Dotmim.Sync.SqlServer.ChangeTracking 0.9.1
Dotmim.Sync.Web.Server 0.9.1

[Mimetis]

let me know 😃

[VagueGit]

Apologies; I’m struggling to understand. I’ve changed the SQL Server retention period to 60 days for each company database. Those companies that were out of date when the retention period was 14 days, still have local data, but have not been able to sync due to this issue.

When they get the version that allows them to sync, they will be within the new 60 days retention period. For those companies, how will DMS handle data that has not been synced for more than 14 days but less than 60 days?

EDIT: The big concern is for those companies that do all data entry on one machine. We can’t lose their data when they try to sync.