'Object reference not set to an instance of an object' error after restarting

Ever since adding hangfire, we now get the following error after restarting our k8s pods. It will eventually start after throwing this error a few times. It seems that each node will throw this error until one starts, then another will not throw and start etc... Like a node is locking something during start, and all others throw this error?

```
Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
at Elsa.Activities.Temporal.Hangfire.Services.HangfireWorkflowDefinitionScheduler.<>c.b__14_0(RecurringJobDto x)
at System.Linq.Utilities.<>c__DisplayClass1_0`1.b__0(TSource x)
at System.Linq.Enumerable.WhereListIterator`1.ToList()
at Elsa.Activities.Temporal.Hangfire.Services.HangfireWorkflowDefinitionScheduler.DeleteRecurringJobs(String workflowDefinitionId)
at Elsa.Activities.Temporal.Hangfire.Services.HangfireWorkflowDefinitionScheduler.UnscheduleAsync(String workflowDefinitionId, CancellationToken cancellationToken)
at Elsa.Activities.Temporal.Common.Handlers.ScheduleTimers.Handle(TriggerIndexingFinished notification, CancellationToken cancellationToken)
at MediatR.NotificationPublishers.ForeachAwaitPublisher.Publish(IEnumerable`1 handlerExecutors, INotification notification, CancellationToken cancellationToken)
at Elsa.Services.Triggers.TriggerIndexer.IndexTriggersAsync(IWorkflowBlueprint workflowBlueprint, CancellationToken cancellationToken)
at Elsa.Services.Triggers.TriggerIndexer.IndexTriggersAsync(IEnumerable`1 workflowBlueprints, CancellationToken cancellationToken)
at Elsa.Services.Triggers.TriggerIndexer.IndexTriggersAsync(CancellationToken cancellationToken)
at Elsa.StartupTasks.IndexTriggers.ExecuteAsync(CancellationToken cancellationToken)
at Elsa.Runtime.StartupRunner.StartupAsync(CancellationToken cancellationToken)
at Elsa.Runtime.StartupRunner.StartupAsync(CancellationToken cancellationToken)
at Elsa.HostedServices.StartupRunnerHostedService.StartAsync(CancellationToken cancellationToken)
at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
at Program.$(String[] args) in /src/Dashboard/Program.cs:line 213
```