diff --git a/public_html/create.php b/public_html/create.php
index ddc1a44a..49f85733 100644
--- a/public_html/create.php
+++ b/public_html/create.php
@@ -37,7 +37,7 @@ if(LSsession :: startLSsession()) {
       if ( LSsession :: canCreate($LSobject) ) {
         $object = new $LSobject();
         
-        if ($_GET['load']!='') {
+        if (isset($_GET['load']) && $_GET['load']!='') {
           $form = $object -> getForm('create',urldecode($_GET['load']));
         }
         else {
diff --git a/public_html/includes/class/class.LSattribute.php b/public_html/includes/class/class.LSattribute.php
index 51ee11ef..8ee43ce3 100644
--- a/public_html/includes/class/class.LSattribute.php
+++ b/public_html/includes/class/class.LSattribute.php
@@ -232,13 +232,16 @@ class LSattribute {
       else if (isset($this -> config['default_value'])) {
         $data=$obj -> getFData($this -> config['default_value']);
       }
+      else {
+        $data=NULL;
+      }
       
       $element = $this -> html -> addToForm($form,$idForm,$data);
       if(!$element) {
         LSerror :: addErrorCode('LSform_06',$this -> name);
       }
 
-      if($this -> config['required']==1) {
+      if(isset($this -> config['required']) && $this -> config['required']==1) {
         $form -> setRequired($this -> name);
       }
 
@@ -568,7 +571,10 @@ class LSattribute {
    * @retval mixed La configuration de validation de l'attribut
    */
   function getValidateConfig() {
-    return $this -> config['validation'];
+    if (isset($this -> config['validation'])) {
+      return $this -> config['validation'];
+    }
+    return;
   }
 
   /**
diff --git a/public_html/includes/class/class.LSform.php b/public_html/includes/class/class.LSform.php
index b33e87e5..8462a648 100644
--- a/public_html/includes/class/class.LSform.php
+++ b/public_html/includes/class/class.LSform.php
@@ -352,7 +352,7 @@ class LSform {
         if (empty($value)) {
           continue;
         }
-        if (!is_array($this -> _rules[$element]))
+        if (!isset($this -> _rules[$element]) || !is_array($this -> _rules[$element]))
           continue;
         LSsession :: loadLSclass('LSformRule');
         foreach($this -> _rules[$element] as $rule) {
diff --git a/public_html/includes/class/class.LSformElement_password.php b/public_html/includes/class/class.LSformElement_password.php
index 30d6eb53..c51966ca 100644
--- a/public_html/includes/class/class.LSformElement_password.php
+++ b/public_html/includes/class/class.LSformElement_password.php
@@ -80,7 +80,7 @@ class LSformElement_password extends LSformElement {
           LSdebug ('send by form');
         }
       }
-      else if ($this -> params['html_options']['mail']['send']==1) {
+      else if (isset($this -> params['html_options']['mail']['isset'])) && $this -> params['html_options']['mail']['send']==1) {
         $this -> sendMail = true;
         LSdebug ('send by config');
       }