TreeView error

Question

Hi,Following errors occur when TreeView DataSource is set:

In the attached sample, the error below occurs when clicking on "Group 1":Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer: Warning: Unhandled exception rendering component: Object reference not set to an instance of an object.System.NullReferenceException: Object reference not set to an instance of an object.   at Syncfusion.Blazor.Navigations.SfTreeView`1.OnAfterScriptRendered()   at Syncfusion.Blazor.SfBaseComponent.OnAfterRenderAsync(Boolean firstRender)   at Syncfusion.Blazor.Navigations.SfTreeView`1.OnAfterRenderAsync(Boolean firstRender)   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost: Error: Unhandled exception in circuit '2WS-petyOgWaZrX1Ltn08wI5JSOD1Pggg658jLj8eME'.System.NullReferenceException: Object reference not set to an instance of an object.   at Syncfusion.Blazor.Navigations.SfTreeView`1.OnAfterScriptRendered()   at Syncfusion.Blazor.SfBaseComponent.OnAfterRenderAsync(Boolean firstRender)   at Syncfusion.Blazor.Navigations.SfTreeView`1.OnAfterRenderAsync(Boolean firstRender)   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer: Warning: Unhandled exception rendering component: Object reference not set to an instance of an object.System.NullReferenceException: Object reference not set to an instance of an object.   at Syncfusion.Blazor.Navigations.Internal.ListGeneration`1.OnAfterRenderAsync(Boolean firstRender)   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost: Error: Unhandled exception in circuit '2WS-petyOgWaZrX1Ltn08wI5JSOD1Pggg658jLj8eME'.System.NullReferenceException: Object reference not set to an instance of an object.   at Syncfusion.Blazor.Navigations.Internal.ListGeneration`1.OnAfterRenderAsync(Boolean firstRender)   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)Attachment: Demo_da9f624c.zip

Sivakumar ShunmugaSundaram · Accepted Answer

Hi MiVision,Thanks for
your patience.We have
validated your reported issue in the Blazor TreeView component, and the
reported issue doesn’t occur in our latest package version of 20.1.52. We have
attached the sample for your reference.Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/Demo1990600795.zipPlease check
the attached sample and get back to us if you need any further assistance.Regards,Sivakumar S

Keerthana Rajendran · Answer

Hi MiVision,Yes, we can replicate the issue with the attached sample but still, we need some additional time to identify the root cause. We will validate and get back to you with further details on May 12, 2022.Regards,Keerthana R.