Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 38:                 If selectedCategory > 0 Then
Line 39:                     Dim parentcategory = categories.Where(Function(o) o.CategoryId = categoryId).FirstOrDefault
Line 40:                     parentCategorieIds.Add(parentcategory.CategoryId)
Line 41:                     GetParents(parentcategory)
Line 42:                 End If

Source File: D:\Inetpub\vhosts\martaponti.be\httpdocs\components\cataloguenavigation\cataloguenavigation.ascx.vb    Line: 40

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   components_cataloguenavigation_cataloguenavigation.Page_Load(Object sender, EventArgs e) in D:\Inetpub\vhosts\martaponti.be\httpdocs\components\cataloguenavigation\cataloguenavigation.ascx.vb:40
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4690.0