Closed Unassigned: System.ThrowHelper.ThrowArgumentNullException [27524]

This error come after using the July 2013 release, as same as my previous issues (#27523, #27519, #27518)

Exception information:
Exception type: System.ArgumentNullException
Exception message: Value cannot be null.
Parameter name: key

Thread information:
Thread ID: 5
Thread account name: IIS APPPOOL\cheungandliu.com
Is impersonating: False
Stack trace: at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
at AjaxControlToolkit.ToolkitScriptManagerCombiner.GetCombinedScriptContent(HttpContextBase context, String[] bundles, String hash)
at AjaxControlToolkit.ToolkitScriptManagerCombiner.OutputCombinedScriptFile(HttpContextBase context)
at AjaxControlToolkit.ToolkitScriptManager.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Comments: Merged with [27525](https://ajaxcontroltoolkit.codeplex.com/workitem/27525)