PowerShell exception at Receive-File dialog

Question

I have a PowerShell code like this

Import-Function Validate-PowerShell

Test-PowerShell

Try
{
   $ctx = get-item .

   Import-Function Import-RedirectMappings
   $file = Receive-File (get-item "master:\media library\Files") -Title "Upload.." -Description "Upload file" -Overwrite    
       ... other code
}
Catch
{
   $ErrorRecord=$Error[0]
   Write-Log -Log Error $ErrorRecord
   Show-Alert "Something went wrong. See SPE logs for more details."
   Close-Window
}

in case Receive-File dialog files is not selected and press ok, user see exception:

[NullReferenceException: Object reference not set to an instance of an object.] Sitecore.UIUtil.GetBrowserClassString() +393
Sitecore.Shell.Controls.Standard.FormPageXmlControl.OnLoad(EventArgs e) +672 System.Web.UI.Control.LoadRecursive() +153
System.Web.UI.Control.LoadRecursive() +250
System.Web.UI.Control.LoadRecursive() +250
System.Web.UI.Control.LoadRecursive() +250
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4081

how it is possible to fix it ?

Answer 1

This appears to be an issue that has been around for some time now. I've reported this issue with the SPE Team.

There is now a fix in place due to be released with 5.1 which changes the alert to a validation message on the existing dialog.