Close concurrent call accesses

src/controllers/user_ws_controller.rs

@@ -573,7 +573,9 @@ pub fn disconnect_user_from_all_sockets(user_id: &UserID) -> Res {
 /// Do something with all active connections
 pub fn foreach_connection<F>(mut f: F) -> Res
     where F: FnMut(&UserWsConnection) -> Res {
-    for conn in get_ws_connections_list().lock().unwrap().iter() {
+    let list = get_ws_connections_list().lock().unwrap().clone();
+
+    for conn in list.iter() {
         f(conn)?;
     }