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 33:                     'eerst opzoeken van de hoofdcategorie van dit product
Line 34:                     Dim parentcategory = categories.Where(Function(o) o.CategoryId = product.CategoryId).FirstOrDefault
Line 35:                     Dim hoofdCat = categories.Where(Function(o) o.CategoryId = parentcategory.ParentId).FirstOrDefault
Line 36:                     'parentCategorieIds.Add(parentcategory.CategoryId)
Line 37:                     selectedCategory = hoofdCat.CategoryId

Source File: D:\Inetpub\vhosts\horestreca.be\httpdocs\components\cataloguetopnavigation\cataloguetopnavigation.ascx.vb    Line: 35

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   _Closure$__3._Lambda$__2(clsProductCategory o) in D:\Inetpub\vhosts\horestreca.be\httpdocs\components\cataloguetopnavigation\cataloguetopnavigation.ascx.vb:35
   System.Linq.WhereListIterator`1.MoveNext() +77
   System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source) +168
   components_cataloguetopnavigation_cataloguetopnavigation.Page_Load(Object sender, EventArgs e) in D:\Inetpub\vhosts\horestreca.be\httpdocs\components\cataloguetopnavigation\cataloguetopnavigation.ascx.vb:35
   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