diff --git a/htdocs/contact/class/contact.class.php b/htdocs/contact/class/contact.class.php
index fd8a2c82101..4fb1e57c9e6 100644
--- a/htdocs/contact/class/contact.class.php
+++ b/htdocs/contact/class/contact.class.php
@@ -136,9 +136,9 @@ class Contact extends CommonObject
         $sql.= "'".$this->db->escape($this->firstname)."',";
 		$sql.= " ".($user->id > 0 ? "'".$user->id."'":"null").",";
 		$sql.= " ".$this->priv.",";
-        $sql.= " ".($this->canvas?"'".$this->canvas."'":"null").",";
+        $sql.= " ".(! empty($this->canvas)?"'".$this->canvas."'":"null").",";
         $sql.= " ".$conf->entity.",";
-        $sql.= " ".$this->import_key;
+        $sql.= " ".(! empty($this->import_key)?"'".$this->import_key."'":"null");
 		$sql.= ")";
 
 		dol_syslog(get_class($this)."::create sql=".$sql);