Hello,

We have an implementation of the multi tree node picker that's worked fine for weeks, but one specific instance of the picker just recently stopped working.  There's one folder which, when expanded in the picker field, doesn't show any child data and throws a .Net exception behind the scenes.  Expanding this same folder in the content tree shows its child data and works fine.  I'm assuming there's some strange content issue that recently caused this one folder to break when shown in the multi tree node picker but everything looks ok and I'm not sure why this would cause it to break. 

Checking the event viewer I see the following exception when the ajax call is made to expand that folder (http://www.mydomain.com/umbraco/webservices/TreeDataService.ashx?rnd=39d4a5c6b18d40e1a11077d24cb83c4a&id=1072&treeType=FilteredContentTree&contextMenu=false&isDialog=true&dialogMode=id&nodeKey=1461&rnd2=20.3)

Server Error in '/' Application.

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The query didn't return a value.

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.ArgumentException: The query didn't return a value.

Source Error: 

Stack Trace: 

[ArgumentException: The query didn't return a value.]
   umbraco.DataLayer.SqlHelper`1.ExecuteXmlReader(String commandText, P[] parameters) +168
   umbraco.DataLayer.SqlHelper`1.ExecuteXmlReader(String commandText, IParameter[] parameters) +140

[SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteXmlReader]
   umbraco.DataLayer.SqlHelper`1.ExecuteXmlReader(String commandText, IParameter[] parameters) +222
   umbraco.cms.businesslogic.web.Document.importXml() +171
   umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) +143
   uComponents.Core.DataTypes.MultiNodeTreePicker.FilteredContentTree.OnRenderNode(XmlTreeNode& xNode, Document doc) +121
   umbraco.cms.presentation.Trees.BaseContentTree.Render(XmlTree& Tree) +288
   umbraco.presentation.webservices.TreeDataService.LoadTree(TreeRequestParams treeParams) +156
   umbraco.presentation.webservices.TreeDataService.GetXmlTree() +198
   umbraco.presentation.webservices.TreeDataService.ProcessRequest(HttpContext context) +85
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75