Applying filter produces JavaScript error

[Alex]

I've got a bound column that may contain null values. If I try to use filtering on it such as "contains" or "equal", I'm getting a javascript error "Object reference not set to an instance of the object". I believe the generated logic should check for null before applying the "contains" filter. Am I doing something wrong here or is it a bug? In some posts I found that EnableLinqExpressions="false"  would fix something like that. However, when I try to do that I'm getting 

Server Error in '/' Application.

---

Cannot interpret token '?' at position 12

The grid is bound to a list of objects and is defined as follows 

<telerik:RadGrid ID="EmployeesRadGrid" runat="server" AutoGenerateColumns="false"
                       AllowPaging="true" OnNeedDataSource="EmployeesRadGrid_NeedDataSource" EnableLinqExpressions="false"
                       oninit="EmployeesRadGrid_Init" onitemcommand="EmployeesRadGrid_ItemCommand">
                       <GroupingSettings CaseSensitive="False" />
                       <ExportSettings HideStructureColumns="true" FileName="Employees" Excel-Format="Biff"
                           OpenInNewWindow="false" Excel-FileExtension="xls" IgnorePaging="true" ExportOnlyData="false" />
                       <MasterTableView EditMode="PopUp" AllowFilteringByColumn="true" AllowSorting="true"
                           CommandItemDisplay="Top">
                           <CommandItemSettings ShowExportToExcelButton="true" ExportToExcelText="Export to Excel"
                               ShowAddNewRecordButton="false" />
                           <Columns>
                               <telerik:GridHyperLinkColumn DataNavigateUrlFields="PersonnelNo" UniqueName="Edit"
                                   AllowFiltering="false" DataNavigateUrlFormatString="EditEmployee.aspx?PersonnelNo={0}"
                                   Text="Edit" >
                               </telerik:GridHyperLinkColumn>
                               <telerik:GridCalculatedColumn HeaderTooltip="*= override" Expression="IsOverriden?  Convert.ToChar(42): Convert.ToChar(32)"
                                   AllowFiltering="false">
                               </telerik:GridCalculatedColumn>
                               <telerik:GridBoundColumn DataField="RacfID" HeaderText="RACF ID" CurrentFilterFunction="Contains"
                                   FilterControlWidth="4em" AutoPostBackOnFilter="true" ShowFilterIcon="true" >
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="FullName" HeaderText="Name" CurrentFilterFunction="Contains"
                                   AutoPostBackOnFilter="true" >
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="PositionName" HeaderText="Job Title" CurrentFilterFunction="Contains"
                                   FilterControlToolTip="Enter search value and press Tab or Enter" FilterControlWidth="9em"
                                   AutoPostBackOnFilter="true" >
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="PersonnelAreaDescription" HeaderText="Work Location"
                                   CurrentFilterFunction="Contains" FilterControlWidth="11em" AutoPostBackOnFilter="true"
                                   ShowFilterIcon="false">
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="OrgUnit" HeaderText="Org Unit" CurrentFilterFunction="Contains"
                                   FilterControlWidth="6em" AutoPostBackOnFilter="true">
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="BusinessSalesUnit" HeaderText="Sls-Bus Unit" FilterDelay="10000"
                                   FilterControlWidth="4em"  AutoPostBackOnFilter="true" >
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="DeptRegion" HeaderText="Dept-Region" CurrentFilterFunction="Contains"
                                   FilterControlWidth="4em" AutoPostBackOnFilter="true" >
                               </telerik:GridBoundColumn>
                               <telerik:GridBoundColumn DataField="CostCenterDisplay" HeaderText="Cost center" CurrentFilterFunction="Contains"
                                   FilterControlWidth="4em" AutoPostBackOnFilter="true" >
                               </telerik:GridBoundColumn>
                           </Columns>
                       </MasterTableView>
                   </telerik:RadGrid>

Thanks,
Alex

[Kostadin]

Hi Alex,

Could you please elaborate a little bit more on your scenario? I was not able to reproduce your issue, so I prepared a small sample and attached it to this forum post. Give it a try and let me know what is the difference between my example and your project.

Regards,
Kostadin
the Telerik team