diff --git a/dblayer.php b/dblayer.php
index d63cac3..0b50512 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -275,7 +275,15 @@ class dblayer extends PDO
         continue;
       }
       // Check for type inconsistencies if the value is provided
-      if ($datas[$key] !== "" && $params[0] === "integer")
+      if (! is_string ($datas[$key]))
+      {
+        $errors[$key] = array ("error", sprintf (
+                            dgettext("domframework",
+                       "Errors in consistency : '%s' is not an string [is %s]"),
+                            $key, gettype ($datas[$key])));
+        continue;
+      }
+      elseif ($datas[$key] !== "" && $params[0] === "integer")
       {
         if (strspn ($datas[$key], "0123456789") !== strlen ($datas[$key]))
         {
@@ -441,6 +449,7 @@ class dblayer extends PDO
       }
     }
 
+$this->debug = 1;
     // Check if the foreign keys constrains are valid before doing the insertion
     foreach ($this->foreign as $foreign=>$data)
     {