SharePoint Duplicate Key

In SharePoint 2010 or 2013 it's possible that when try to open "content or structure" on the settings.aspx page or when try to open a list or all lists that you get an error telling you that a duplicate key exists. The duplicate key is related to a list somewhere in the SharePoint site-collection.

The issue is at hand is that you won't be able to find it using the GUI. So i thought i would share my powershell script that will check for duplicate lists / keys so that you know which list to remove via disabling a feature or just by removing it with powershell. (will also work with host named site collections)

code:


Function Get-Duplicate {
    param($array, [switch]$count)
    begin {
        $hash = @{}
    }
    process {
        $array | %{ $hash[$_] = $hash[$_] + 1 }
        if($count) {
            $hash.GetEnumerator() | ?{$_.value -gt 1} | %{
                New-Object PSObject -Property @{
                    Value = $_.key
                    Count = $_.value
                }
            }
        }
        else {
            $hash.GetEnumerator() | ?{$_.value -gt 1} | %{$_.key}
        }   
    }
}
#Itterating through lists in web for duplicate objects
$webapps = get-spwebapplication

        Foreach ($wa in $webapps)
        {
            $sites = $wa.Sites
   
                Foreach ($site in $sites)
                    {
                        $Webs = $site.AllWebs                   
                       
                            Foreach ($web in $webs)
                                {
                                write-host -foregroundcolor DarkGreen $web.url
                                $Lists = $web.Lists
                                $array = @()
                                $lists | %{$array += $_.Title}
                                Get-Duplicate $array
                                }
                                                                       
}
}