I was trying to post a question with title

Should Source and Object return the same value when building property value converters for custom data types that have their value in JSON?

And the "post topic" buttons stays with the 3 dots... doesn't give any errors, but when looking at the response of the web api request I get the following error.

{"Message":"An error has occurred.","ExceptionMessage":"String or binary data would be truncated.
The statement has been terminated.","ExceptionType":"System.Data.SqlClient.SqlException","StackTrace":"   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
at System.Data.SqlClient.SqlDataReader.get_MetaData()
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteScalar()
at StackExchange.Profiling.Data.ProfiledDbCommand.ExecuteScalar() in c:\\Code\\github\\SamSaffron\\MiniProfiler\\StackExchange.Profiling\\Data\\ProfiledDbCommand.cs:line 299
at Umbraco.Core.Persistence.PetaPocoCommandExtensions.<>c__DisplayClassa.<ExecuteScalarWithRetry>b__9()
at Umbraco.Core.Persistence.FaultHandling.RetryPolicy.ExecuteAction[TResult](Func`1 func)
at Umbraco.Core.Persistence.Database.Insert(String tableName, String primaryKeyName, Boolean autoIncrement, Object poco)
at Umbraco.Core.Persistence.Database.Save(String tableName, String primaryKeyName, Object poco)
at OurUmbraco.Forum.Services.TopicService.Save(Topic topic)
   at OurUmbraco.Forum.Api.ForumController.Topic(TopicSaveModel model)
      at lambda_method(Closure , Object , Object[] )
         at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
            at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
            --- 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`1.GetResult()
                        at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.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`1.GetResult()
                                    at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.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.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.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`1.GetResult()
                                                         at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"}

I guess somewhere something is too long.