diff --git a/Set-Column.ps1 b/Set-Column.ps1
index d1f3590..36eb2eb 100644
--- a/Set-Column.ps1
+++ b/Set-Column.ps1
@@ -131,6 +131,7 @@
         $endRow                            = $Worksheet.Dimension.End.Row
     }
     process {
+        if ($null -eq $workSheet.Dimension) {Write-Warning "Can't format an empty worksheet."; return}
         if ($Column  -eq 0 )  {$Column     = $endColumn    + 1 }
         $columnName = [OfficeOpenXml.ExcelCellAddress]::new(1,$column).Address -replace "1",""
         Write-Verbose -Message "Updating Column $columnName"
diff --git a/Set-Row.ps1 b/Set-Row.ps1
index d286090..5d36365 100644
--- a/Set-Row.ps1
+++ b/Set-Row.ps1
@@ -126,6 +126,7 @@
         $endRow                              = $Worksheet.Dimension.End.Row
     }
     process {
+        if ($null -eq $workSheet.Dimension) {Write-Warning "Can't format an empty worksheet."; return}
         if      ($Row  -eq 0 ) {$Row         = $endRow + 1 }
         Write-Verbose -Message "Updating Row $Row"
         #Add a row label