diff --git a/Controllers/ResponseEnricher.cs b/Controllers/ResponseEnricher.cs
index 0ba829a..29e1f8b 100644
--- a/Controllers/ResponseEnricher.cs
+++ b/Controllers/ResponseEnricher.cs
@@ -64,6 +64,8 @@ public static class Responses
             //limit the name to 31 characters
             sheetName = name.Length > 31 ? name.Substring(0, 31) : name;
         }
+        //make sure sheet is only alphanumeric
+        sheetName = new string(sheetName.Where(char.IsLetterOrDigit).ToArray());
 
         var notebook = new XLWorkbook();
         var sheet = notebook.Worksheets.Add(sheetName);