Latest OrchestrationSessionManager changes are throwing unhandled exceptions in Azure.

The line for the exception looks ok, so not sure what the reason is. I do not have a local environment to debug this project. I have been running for over a year and after upgrading to recent release, this happens very frequently and doesn't recover.

Application: w3wp.exe CoreCLR Version: 4.6.28008.2 Description: The process was terminated due to an unhandled exception. Exception Info: System.NullReferenceException: Object reference not set to an instance of an object. at DurableTask.AzureStorage.OrchestrationSessionManager.AddMessageToPendingOrchestration(ControlQueue controlQueue, IEnumerable`1 queueMessages, Guid traceActivityId, CancellationToken cancellationToken) in C:\source\durabletask\src\DurableTask.AzureStorage\OrchestrationSessionManager.cs:line 169 at DurableTask.AzureStorage.OrchestrationSessionManager.DequeueLoop(String partitionId, ControlQueue controlQueue, CancellationToken cancellationToken) in C:\source\durabletask\src\DurableTask.AzureStorage\OrchestrationSessionManager.cs:line 117 at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) --- End of stack trace from previous location where exception was thrown --- at System.Threading.ThreadPoolWorkQueue.Dispatch()