diff --git a/Controllers/TimbratureController.cs b/Controllers/TimbratureController.cs
index a50403d..c4e0e70 100644
--- a/Controllers/TimbratureController.cs
+++ b/Controllers/TimbratureController.cs
@@ -16,7 +16,7 @@ namespace VirtualTask.Controllers
         string tenant = string.Empty;
         string errMes = string.Empty;
         string admin = string.Empty;
-        string time_sheet=string.Empty;
+        string time_sheet = string.Empty;
         HttpClient client;
 
         private readonly IConfiguration _configuration;
@@ -117,7 +117,6 @@ namespace VirtualTask.Controllers
         {
             SessionHelper helper = new SessionHelper(this);
 
-
             token = helper.GetStringValue("tok");
 
             apiUrl = helper.GetStringValue("apiUrl");
@@ -204,6 +203,18 @@ namespace VirtualTask.Controllers
         public IActionResult ExportExcel(DateTime dataIni, DateTime dataFin, string commessa, string? tecnico)
         {
             SessionHelper helper = new SessionHelper(this);
+
+            //16/09/2024 messo questo controllo perchè se faccio esporta senza aver fatto cerca va in errore quando crea file excel.
+            if (tecnico.Equals("System.Collections.Generic.List`1[Microsoft.AspNetCore.Mvc.Rendering.SelectListItem]"))
+            {
+                tecnico = string.Empty;
+            }
+
+            if (commessa.Equals("System.Collections.Generic.List`1[Microsoft.AspNetCore.Mvc.Rendering.SelectListItem]"))
+            {
+                commessa = string.Empty;
+            }
+
             token = helper.GetStringValue("tok");
             if (string.IsNullOrEmpty(token))
             {
@@ -233,6 +244,7 @@ namespace VirtualTask.Controllers
                 {
                     modelList = modelList.Where(x => x.data_timbratura.GetValueOrDefault().Date >= dataIni.Date).ToList();
                 }
+
                 if (dataFin.Date != DateTime.MinValue)
                 {
                     modelList = modelList.Where(x => x.data_timbratura.GetValueOrDefault().Date <= dataFin.Date).ToList();