ERROR IN FILTER: System.NullReferenceException: Object reference not set to an instance of an object.
   at IfourTechnolab.Controllers.BlogController.GetRecentPostAndCategory(BlogViewModel model) in C:\agent\dir\1227\s\ifourtechnolab.com-mvc\IfourTechnolab\Controllers\BlogController.cs:line 140
   at IfourTechnolab.Controllers.BlogController.BlogDetail(String slug) in C:\agent\dir\1227\s\ifourtechnolab.com-mvc\IfourTechnolab\Controllers\BlogController.cs:line 129
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)