diff --git a/dblayer.php b/dblayer.php
index e52c0b1..b42e7ab 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -101,6 +101,8 @@ class dblayer extends PDO
         $datas[$key] = null;
       if (in_array ("not null", $params) && !array_key_exists ($key, $datas))
         throw new Exception ("Mandatory field '$key' not provided", 405);
+      if (!array_key_exists ($key, $datas))
+        continue;
       // Verify the fields, if $verify is defined, before doing insertion
       $verify = $this->verifyOne ($key, $datas[$key]);
       if (is_array ($verify) && count ($verify))