Error: Value cannot be null - when entering a donation on a page that uses the Payment 2.0 part

When entering an amount and clicking "Continue" on a page that uses the Payment 2.0 part, users may receive the following error:

 

[ArgumentNullException: Value cannot be null.

Parameter name: s]

   System.IO.StringReader..ctor(String s) +14368182

   Blackbaud.Web.Content.Core.Data.SessionBackup.XmlStringToXmlTypes(String xmlString) +105

   Blackbaud.Web.Content.Core.Data.SessionBackup.LoadBackUpData(Guid keyGuid) +575

   Blackbaud.Web.Content.Core.Data.SessionBackup..ctor(Guid keyGuid) +306

   Blackbaud.AppFx.ContentManagement.Parts.ShoppingCart.UI.CartDisplay.FindAndDeleteRecentSessionBackUpsForThisCart() +772

   Blackbaud.AppFx.ContentManagement.Parts.ShoppingCart.UI.CartDisplay.DataBindViewItems() +357

   Blackbaud.AppFx.ContentManagement.Parts.ShoppingCart.UI.CartDisplay.DataBindActiveView(View view) +116

   Blackbaud.AppFx.ContentManagement.Parts.ShoppingCart.UI.CartDisplay.LoadPart() +402

   Blackbaud.AppFx.ContentManagement.Parts.ShoppingCart.UI.CartDisplay.Page_Load(Object sender, EventArgs e) +192

   System.Web.UI.Control.LoadRecursive() +71

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Control.LoadRecursive() +190

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178

Download and install the latest patch which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.

Environment

 Blackbaud Internet Solutions
 3.0
 3.0
 Service Pack 13
 4.0.131, patch 2

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