diff --git a/htdocs/adherents/class/api_members.class.php b/htdocs/adherents/class/api_members.class.php
index 4ab32e7788f..9b55ef995f7 100644
--- a/htdocs/adherents/class/api_members.class.php
+++ b/htdocs/adherents/class/api_members.class.php
@@ -267,7 +267,7 @@ class Members extends DolibarrApi
     /**
      * Validate fields before creating an object
      *
-     * @param array $data   Data to validate
+     * @param array|null    $data   Data to validate
      * @return array
      *
      * @throws RestException
diff --git a/htdocs/adherents/class/api_subscriptions.class.php b/htdocs/adherents/class/api_subscriptions.class.php
index 13eaf4dfb10..2dd2a609e63 100644
--- a/htdocs/adherents/class/api_subscriptions.class.php
+++ b/htdocs/adherents/class/api_subscriptions.class.php
@@ -230,7 +230,7 @@ class Subscriptions extends DolibarrApi
     /**
      * Validate fields before creating an object
      *
-     * @param array $data   Data to validate
+     * @param array|null    $data   Data to validate
      * @return array
      *
      * @throws RestException
diff --git a/htdocs/categories/class/api_categories.class.php b/htdocs/categories/class/api_categories.class.php
index 76c7a9dc794..616ffcc31cd 100644
--- a/htdocs/categories/class/api_categories.class.php
+++ b/htdocs/categories/class/api_categories.class.php
@@ -262,6 +262,7 @@ class Categories extends DolibarrApi
         if(! DolibarrApiAccess::$user->rights->categorie->creer) {
 			throw new RestException(401);
 		}
+
         // Check mandatory fields
         $result = $this->_validate($request_data);
         
@@ -341,7 +342,7 @@ class Categories extends DolibarrApi
     /**
      * Validate fields before create or update object
      * 
-     * @param array $data   Data to validate
+     * @param array|null    $data    Data to validate
      * @return array
      * 
      * @throws RestException
diff --git a/htdocs/categories/class/api_deprecated_category.class.php b/htdocs/categories/class/api_deprecated_category.class.php
index e18ada34e0a..106927a1a33 100644
--- a/htdocs/categories/class/api_deprecated_category.class.php
+++ b/htdocs/categories/class/api_deprecated_category.class.php
@@ -471,7 +471,7 @@ class CategoryApi extends DolibarrApi
     /**
      * Validate fields before create or update object
      * 
-     * @param array $data   Data to validate
+     * @param array|null    $data   Data to validate
      * @return array
      * 
      * @throws RestException
diff --git a/htdocs/compta/bank/class/api_bankaccounts.class.php b/htdocs/compta/bank/class/api_bankaccounts.class.php
index 0350e2b28a0..3ea07bb098a 100644
--- a/htdocs/compta/bank/class/api_bankaccounts.class.php
+++ b/htdocs/compta/bank/class/api_bankaccounts.class.php
@@ -226,7 +226,7 @@ class BankAccounts extends DolibarrApi
     /**
      * Validate fields before creating an object
      *
-     * @param array $data    Data to validate
+     * @param array|null    $data    Data to validate
      * @return array
      *
      * @throws RestException
diff --git a/htdocs/societe/class/api_contacts.class.php b/htdocs/societe/class/api_contacts.class.php
index 13b31db59a4..11cd1fee919 100644
--- a/htdocs/societe/class/api_contacts.class.php
+++ b/htdocs/societe/class/api_contacts.class.php
@@ -321,7 +321,7 @@ class Contacts extends DolibarrApi
 	/**
 	 * Validate fields before create or update object
      * 
-	 * @param   array $data Data to validate
+	 * @param   array|null     $data   Data to validate
 	 * @return  array
 	 * @throws RestException
 	 */
diff --git a/htdocs/societe/class/api_deprecated_contact.class.php b/htdocs/societe/class/api_deprecated_contact.class.php
index e645c3e15ff..56ef1eec19a 100644
--- a/htdocs/societe/class/api_deprecated_contact.class.php
+++ b/htdocs/societe/class/api_deprecated_contact.class.php
@@ -278,7 +278,7 @@ class ContactApi extends DolibarrApi
 	/**
 	 * Validate fields before create or update object
      * 
-	 * @param   array $data Data to validate
+	 * @param   array|null     $data   Data to validate
 	 * @return  array
 	 * @throws RestException
 	 */
diff --git a/htdocs/user/class/api_deprecated_user.class.php b/htdocs/user/class/api_deprecated_user.class.php
index c9fcb2b0dd7..f080e8a3b45 100644
--- a/htdocs/user/class/api_deprecated_user.class.php
+++ b/htdocs/user/class/api_deprecated_user.class.php
@@ -256,7 +256,7 @@ class UserApi extends DolibarrApi
 	/**
 	 * Validate fields before create or update object
      * 
-	 * @param   array $data Data to validate
+	 * @param   array|null     $data   Data to validate
 	 * @return  array
 	 * @throws RestException
 	 */
diff --git a/htdocs/user/class/api_users.class.php b/htdocs/user/class/api_users.class.php
index f41e2d3ebca..e177b4d52ec 100644
--- a/htdocs/user/class/api_users.class.php
+++ b/htdocs/user/class/api_users.class.php
@@ -277,7 +277,7 @@ class Users extends DolibarrApi
 	/**
 	 * Validate fields before create or update object
      * 
-	 * @param   array $data Data to validate
+	 * @param   array|null     $data   Data to validate
 	 * @return  array
 	 * @throws RestException
 	 */