diff --git a/Export-Excel.ps1 b/Export-Excel.ps1
index 58bde31..8e955b3 100644
--- a/Export-Excel.ps1
+++ b/Export-Excel.ps1
@@ -1339,6 +1339,14 @@ function Add-ExcelTable {
         [Switch]$PassThru
     )
     try {
+        if ([OfficeOpenXml.FormulaParsing.ExcelUtilities.ExcelAddressUtil]::IsValidAddress($TableName)) {
+            Write-Warning -Message "$tableName reads as an Excel address, and so is not allowed as a table name."
+            return
+        }
+        if ($tableName -notMatch '^[A-Z]') {
+            Write-Warning -Message "$tableName is not allowed as a table name because it does not begin with a letter."
+            return
+        }
         if ($TableName -match "\W") {
             Write-Warning -Message "At least one character in $TableName is illegal in a table name and will be replaced with '_' . "
             $TableName = $TableName -replace '\W', '_'
diff --git a/New-ConditionalText.ps1 b/New-ConditionalText.ps1
index 29d58fe..3f32fb6 100644
--- a/New-ConditionalText.ps1
+++ b/New-ConditionalText.ps1
@@ -36,8 +36,8 @@ function New-ConditionalText {
 
         This builds on the previous example, and specifies a condition of <=3 with
         a format of red text on a white background; this applies to a named range
-        "Finish Position". The range could be written "C:C" to specify a named
-        column, or "C2:C102" to specify certain cells in the column.
+        "Finish Position". The range could be written -Range "C:C" to specify a
+        named column, or -Range "C2:C102" to specify certain cells in the column.
       .Link
         Add-Add-ConditionalFormatting
         New-ConditionalFormattingIconSet
diff --git a/README.md b/README.md
index 0f49ce6..10fbc5d 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,9 @@ Install-Module ImportExcel -scope CurrentUser
 Install-Module ImportExcel
 ```
 
+# What's new
+- Set-ExcelRow and Set-ExcelColumn now check that the worksheet name they passed exists in the workbook.      
+
 # What's new 5.4
 
 - Thank you to Conrad Agramont, Twitter: [@AGramont](https://twitter.com/@AGramont) for the `AddMultiWorkSheet.ps1` example. Much appreciated!
diff --git a/Set-Column.ps1 b/Set-Column.ps1
index 36a181e..e0eeebd 100644
--- a/Set-Column.ps1
+++ b/Set-Column.ps1
@@ -121,7 +121,12 @@
 
     begin {
         #if we were passed a package object and a worksheet name , get the worksheet.
-        if ($ExcelPackage)   {$Worksheet   = $ExcelPackage.Workbook.Worksheets[$Worksheetname] }
+        if ($ExcelPackage)  {
+            if ($ExcelPackage.Workbook.Worksheets.Name -notcontains $Worksheetname) {
+                throw "The Workbook does not contain a sheet named '$Worksheetname'"
+            }
+            else {$Worksheet   = $ExcelPackage.Workbook.Worksheets[$Worksheetname] }
+        }
 
         #In a script block to build a formula, we may want any of corners or the column name,
         #if Column and Startrow aren't specified, assume first unused column, and first row
diff --git a/Set-Row.ps1 b/Set-Row.ps1
index 5d36365..fe385c8 100644
--- a/Set-Row.ps1
+++ b/Set-Row.ps1
@@ -116,8 +116,12 @@
     )
     begin {
         #if we were passed a package object and a worksheet name , get the worksheet.
-        if ($ExcelPackage)     {$Worksheet   = $ExcelPackage.Workbook.worksheets[$Worksheetname] }
-
+        if ($ExcelPackage)  {
+            if ($ExcelPackage.Workbook.Worksheets.Name -notcontains $Worksheetname) {
+                throw "The Workbook does not contain a sheet named '$Worksheetname'"
+            }
+            else {$Worksheet   = $ExcelPackage.Workbook.Worksheets[$Worksheetname] }
+        }
         #In a script block to build a formula, we may want any of corners or the columnname,
         #if row and start column aren't specified assume first unused row, and first column
         if (-not $StartColumn) {$StartColumn = $Worksheet.Dimension.Start.Column    }