diff --git a/htdocs/contact/class/contact.class.php b/htdocs/contact/class/contact.class.php
index 713ea98bf4f..cc3688d03a0 100644
--- a/htdocs/contact/class/contact.class.php
+++ b/htdocs/contact/class/contact.class.php
@@ -550,7 +550,6 @@ class Contact extends CommonObject
 		$this->fax = trim($this->fax);
 		$this->zip = (empty($this->zip) ? '' : trim($this->zip));
 		$this->town = (empty($this->town) ? '' : trim($this->town));
-		$this->ref_ext = trim($this->ref_ext);
 		$this->setUpperOrLowerCase();
 		$this->country_id = ($this->country_id > 0 ? $this->country_id : $this->country_id);
 		if (empty($this->statut)) {
@@ -561,20 +560,19 @@ class Contact extends CommonObject
 		}
 		$this->db->begin();
 
-		$sql = "UPDATE ".MAIN_DB_PREFIX."socpeople SET ";
+		$sql = "UPDATE ".MAIN_DB_PREFIX."socpeople SET";
 		if ($this->socid > 0) {
-			$sql .= " fk_soc='".$this->db->escape($this->socid)."',";
+			$sql .= " fk_soc = ".((int) $this->socid).",";
 		} elseif ($this->socid == -1) {
-			$sql .= " fk_soc=null,";
+			$sql .= " fk_soc = NULL,";
 		}
-		$sql .= " ref_ext='".$this->db->escape($this->ref_ext)."'";
-		$sql .= ", civility='".$this->db->escape($this->civility_code)."'";
+		$sql .= " civility='".$this->db->escape($this->civility_code)."'";
 		$sql .= ", lastname='".$this->db->escape($this->lastname)."'";
 		$sql .= ", firstname='".$this->db->escape($this->firstname)."'";
 		$sql .= ", address='".$this->db->escape($this->address)."'";
 		$sql .= ", zip='".$this->db->escape($this->zip)."'";
 		$sql .= ", town='".$this->db->escape($this->town)."'";
-		$sql .= ", ref_ext = ".(!empty($this->ref_ext) ? "'".$this->db->escape($this->ref_ext)."'" : "null");
+		$sql .= ", ref_ext = ".(!empty($this->ref_ext) ? "'".$this->db->escape($this->ref_ext)."'" : "NULL");
 		$sql .= ", fk_pays=".($this->country_id > 0 ? $this->country_id : 'NULL');
 		$sql .= ", fk_departement=".($this->state_id > 0 ? $this->state_id : 'NULL');
 		$sql .= ", poste='".$this->db->escape($this->poste)."'";
@@ -583,11 +581,11 @@ class Contact extends CommonObject
 		$sql .= ", socialnetworks = '".$this->db->escape(json_encode($this->socialnetworks))."'";
 		$sql .= ", photo='".$this->db->escape($this->photo)."'";
 		$sql .= ", birthday=".($this->birthday ? "'".$this->db->idate($this->birthday)."'" : "null");
-		$sql .= ", note_private = ".(isset($this->note_private) ? "'".$this->db->escape($this->note_private)."'" : "null");
-		$sql .= ", note_public = ".(isset($this->note_public) ? "'".$this->db->escape($this->note_public)."'" : "null");
-		$sql .= ", phone = ".(isset($this->phone_pro) ? "'".$this->db->escape($this->phone_pro)."'" : "null");
-		$sql .= ", phone_perso = ".(isset($this->phone_perso) ? "'".$this->db->escape($this->phone_perso)."'" : "null");
-		$sql .= ", phone_mobile = ".(isset($this->phone_mobile) ? "'".$this->db->escape($this->phone_mobile)."'" : "null");
+		$sql .= ", note_private = ".(isset($this->note_private) ? "'".$this->db->escape($this->note_private)."'" : "NULL");
+		$sql .= ", note_public = ".(isset($this->note_public) ? "'".$this->db->escape($this->note_public)."'" : "NULL");
+		$sql .= ", phone = ".(isset($this->phone_pro) ? "'".$this->db->escape($this->phone_pro)."'" : "NULL");
+		$sql .= ", phone_perso = ".(isset($this->phone_perso) ? "'".$this->db->escape($this->phone_perso)."'" : "NULL");
+		$sql .= ", phone_mobile = ".(isset($this->phone_mobile) ? "'".$this->db->escape($this->phone_mobile)."'" : "NULL");
 		$sql .= ", priv = '".$this->db->escape($this->priv)."'";
 		$sql .= ", fk_prospectcontactlevel = '".$this->db->escape($this->fk_prospectlevel)."'";
 		if (isset($this->stcomm_id)) {