transaction api error

Внутренняя ошибка сервера:
System.InvalidOperationException: Sequence contains no elements
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at LinqToDB.Linq.Builder.FirstSingleBuilder.FirstSingleContext.<>c__DisplayClass12`1.<BuildQuery>b__c(QueryContext ctx, IDataContextInfo db, Expression expr, Object[] ps)
   at LinqToDB.Linq.ExpressionQuery`1.System.Linq.IQueryProvider.Execute[TResult](Expression expression)
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
--- 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 Rbp.Core.Client.AppServices.Accounts.Transactions.GetMainTransactionQuery.<BuildTransactionAsync>d__6.MoveNext() in C:\Projects\remote-banking-platform\Core\Client\Rbp.Core.Client.AppServices\Accounts\Transactions\GetMainTransactionQuery.cs:line 85
--- 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 Rbp.Core.Client.AppServices.Accounts.Transactions.GetMainTransactionQuery.<>c__DisplayClass5_0.<<Handle>b__0>d.MoveNext() in C:\Projects\remote-banking-platform\Core\Client\Rbp.Core.Client.AppServices\Accounts\Transactions\GetMainTransactionQuery.cs:line 67
--- 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 Rbp.Common.DataAccess.LinqToDb.DbReader`1.<GetAsync>d__2`1.MoveNext() in C:\Projects\remote-banking-platform\Common\Rbp.Common.DataAccess\LinqToDb\DbReader.cs:line 0
--- 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 Rbp.Core.Client.AppServices.Accounts.Transactions.GetMainTransactionQuery.<Handle>d__5.MoveNext() in C:\Projects\remote-banking-platform\Core\Client\Rbp.Core.Client.AppServices\Accounts\Transactions\GetMainTransactionQuery.cs:line 45
--- 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 Rbp.Core.Client.WebApi.Accounts.TransactionsController.<GetMainTransaction>d__3.MoveNext() in C:\Projects\remote-banking-platform\Core\Client\Rbp.Core.Client.WebApi\Accounts\TransactionsController.cs:line 51
--- 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 Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionFilterAsync>d__28.MoveNext()