Getting random 'InputObject' validation error in script - powershell

Question

when executing my script I am getting an Error that I do not quite understand. It tells me that there is a validation error.
I have tested out some different variations but it keeps coming down to the same error.
ForEach ($Index in $SQLServer)
{
$ServiceStatus = Invoke-Command {Get-Service 'MSSQLSERVER'} -comp $Index
while ($FilteredService.Status -ne 'Running')
{
Invoke-Command {Start-Service $ServiceStatus} -comp $Index
Write-Host $ServiceStatus.Status
Write-Host "SQL Service starting on " $Index
function Check-Status
{
Start-Sleep -seconds 30
$ServiceStatus.Refresh()
if ($ServiceStatus.Status -eq 'Running')
{
Write-Host "SQL Service running"
}
else
{
Check-Status
}
}
}
}
The error is like this:
Cannot validate argument on parameter 'InputObject'.The argument is null or empty. Provide an arguemnt that is not null or empty, and then try the command again.
+ CategoryInfo : InvalidData: (:) [Start-Service], ParameterBindingValidationException
+ FullyQualifiedErrorId: ParameterArgumentValidationError...
Normally this error occurs once some parameter has not been initialized yet , but I just cant figure out which one that is. Any help would be appreciated.
EDIT:
ForEach ($Index in $SQLServer)
{
$ArrayService = Invoke-Command {Get-Service -Name 'MSSQLSERVER'} -comp $Index
if ($ArrayService.Status -ne 'Running')
{
Invoke-Command {Start-Service $script:ArrayService} -comp $Index
Write-Host $ArrayService.Status
Write-Host "SQL Service starting on " $Index
function Check-Status
{
Start-Sleep -seconds 30
$ArrayService.Refresh()
if ($ArrayService.Status -eq 'Running')
{
Write-Host "SQL Service running"
}
else
{
Check-Status
}
Check-Status
}
}
}