I'm trying to write a powershell script to go through all the sub sites in a site collection and remove a node that is no longer required.

I've placed my script below - but I'm getting an error on Get-SPWeb : The pipeline has been stopped - I'm thinking I may need to set a parameter to stop the pipe being closed? Any help is awesome!

$site = Get-SPSite http://sitecollurl  

$site | get-spweb -limit all | foreach-object{ 

    $webURL = $_.url 

    $web = Get-SPWeb $webURL 

    $navigationNodes = $web.Navigation.QuickLaunch 

    ForEach ($Node in $NavigationNodes) 
    { 
        if($node.Title -eq "My User Profile") 
        { 
        $node.Delete()   
        } 
    } 
   $web.Dispose() 
}