diff --git a/htdocs/adherents/class/adherent.class.php b/htdocs/adherents/class/adherent.class.php
index 6dbd466b220..eb3e225c4d6 100644
--- a/htdocs/adherents/class/adherent.class.php
+++ b/htdocs/adherents/class/adherent.class.php
@@ -1334,7 +1334,8 @@ class Adherent extends CommonObject
 					$arraysocialnetworks['linkedin'] = $obj->linkedin;
 					$updatesocial = true;
 				}
-				$this->socialnetworks = array_merge($arraysocialnetworks, json_decode($obj->socialnetworks, true));
+				$socialarray = ($obj->socialnetworks==''?array():json_decode($obj->socialnetworks, true));
+				$this->socialnetworks = array_merge($arraysocialnetworks, $socialarray);
 				if ($updatesocial) {
 					$sqlupd = 'UPDATE '.MAIN_DB_PREFIX.'adherent SET skype=null';
 					$sqlupd .= ', twitter=null';
diff --git a/htdocs/user/class/user.class.php b/htdocs/user/class/user.class.php
index 20a2fbb6fc2..cfb79cfc06f 100644
--- a/htdocs/user/class/user.class.php
+++ b/htdocs/user/class/user.class.php
@@ -399,7 +399,8 @@ class User extends CommonObject
 					$arraysocialnetworks['linkedin'] = $obj->linkedin;
 					$updatesocial = true;
 				}
-				$this->socialnetworks = array_merge($arraysocialnetworks, json_decode($obj->socialnetworks, true));
+				$socialarray = ($obj->socialnetworks==''?array():json_decode($obj->socialnetworks, true));
+				$this->socialnetworks = array_merge($arraysocialnetworks, $socialarray);
 				if ($updatesocial) {
 					$sqlupd = 'UPDATE '.MAIN_DB_PREFIX.'user SET skype=null';
 					$sqlupd .= ', twitter=null';