[NullReferenceException: Object reference not set to an instance of an object.]
ATRO_Corporate_Git.ProductListFilter.partsCategory1List_SelectedIndexChanged(Object sender, EventArgs e) in C:\Users\Luke\source\repos\ATRO-WebOps-Git\ATRO Corporate Git\ProductListFilter.aspx.cs:683
ATRO_Corporate_Git.ProductListFilter.Page_Load(Object sender, EventArgs e) in C:\Users\Luke\source\repos\ATRO-WebOps-Git\ATRO Corporate Git\ProductListFilter.aspx.cs:149
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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