From c96a3bfc13105da987e4f41c6c6e52c12f1bfe87 Mon Sep 17 00:00:00 2001
From: Laurent Destailleur <eldy@destailleur.fr>
Date: Fri, 15 Jul 2016 14:14:55 +0200
Subject: [PATCH] Fix when going back on an export page after session has
 expired to avoid a technical error.

---
 htdocs/exports/export.php | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/htdocs/exports/export.php b/htdocs/exports/export.php
index 11ae0fc9218..02a650a2e10 100644
--- a/htdocs/exports/export.php
+++ b/htdocs/exports/export.php
@@ -638,7 +638,14 @@ if ($step == 2 && $datatoexport)
 
 if ($step == 3 && $datatoexport)
 {
-	llxHeader('',$langs->trans("NewExport"),'EN:Module_Exports_En|FR:Module_Exports|ES:M&oacute;dulo_Exportaciones');
+    if (count($array_selected) < 1)      // This occurs when going back to page after sessecion expired
+    {
+        // Switch to step 2
+        header("Location: ".DOL_URL_ROOT.'/exports/export.php?step=2&datatoexport='.$datatoexport);
+        exit;
+    }
+
+    llxHeader('',$langs->trans("NewExport"),'EN:Module_Exports_En|FR:Module_Exports|ES:M&oacute;dulo_Exportaciones');
 
 	/*
 	 * Affichage onglets
@@ -792,6 +799,13 @@ if ($step == 3 && $datatoexport)
 
 if ($step == 4 && $datatoexport)
 {
+    if (count($array_selected) < 1)     // This occurs when going back to page after sessecion expired
+    {
+        // Switch to step 2
+        header("Location: ".DOL_URL_ROOT.'/exports/export.php?step=2&datatoexport='.$datatoexport);
+        exit;
+    }
+    
     asort($array_selected);
 
     llxHeader('',$langs->trans("NewExport"),'EN:Module_Exports_En|FR:Module_Exports|ES:M&oacute;dulo_Exportaciones');
@@ -1017,6 +1031,13 @@ if ($step == 4 && $datatoexport)
 
 if ($step == 5 && $datatoexport)
 {
+    if (count($array_selected) < 1)      // This occurs when going back to page after sessecion expired
+    {
+        // Switch to step 2
+        header("Location: ".DOL_URL_ROOT.'/exports/export.php?step=2&datatoexport='.$datatoexport);
+        exit;
+    }
+    
 	asort($array_selected);
 
     llxHeader('',$langs->trans("NewExport"),'EN:Module_Exports_En|FR:Module_Exports|ES:M&oacute;dulo_Exportaciones');