diff --git a/htdocs/exports/export.class.php b/htdocs/exports/export.class.php
index 2464b2a0278..a8a6c96c037 100644
--- a/htdocs/exports/export.class.php
+++ b/htdocs/exports/export.class.php
@@ -118,11 +118,15 @@ class Export
                             $this->array_export_alias[$i]=$module->export_alias_array[$r];
 
                             // Charge fichier lang en rapport
-                            foreach($module->getLangFilesArray() as $key) 
+                            $langtoload=$module->getLangFilesArray();
+                            if (is_array($langtoload))
                             {
-                                $langs->load($key);
+                                foreach($langtoload as $key) 
+                                {
+                                    $langs->load($key);
+                                }
                             }
-                            
+                                                        
                             dolibarr_syslog("Export chargé pour le module ".$modulename." en index ".$i.", dataset=".$module->export_code[$r].", nbre de champs=".sizeof($module->export_fields_code[$r]));
                             $i++;
                         }
diff --git a/htdocs/exports/export.php b/htdocs/exports/export.php
index a747711a90d..09a5cf7b58d 100644
--- a/htdocs/exports/export.php
+++ b/htdocs/exports/export.php
@@ -91,9 +91,12 @@ if ($action=='downfield' || $action=='upfield')
         }
     }
     //print("Switch pos=$pos (code=".$_GET["field"].") and newpos=$newpos (code=$newcode)");
-    $array_selected[$_GET["field"]]=$newpos;
-    $array_selected[$newcode]=$pos;
-    $_SESSION["export_selected_fields"]=$array_selected;
+    if ($newcode)   // Si newcode trouvé (prtoection contre resoumission de page
+    {
+        $array_selected[$_GET["field"]]=$newpos;
+        $array_selected[$newcode]=$pos;
+        $_SESSION["export_selected_fields"]=$array_selected;
+    }
 }
 
 if ($step == 1 || $action == 'cleanselect')