diff -r 0606f89698e7 -r bb93e9642b5b rust/hedgewars-server/src/handlers.rs
--- a/rust/hedgewars-server/src/handlers.rs	Sat Dec 28 19:41:05 2019 +0300
+++ b/rust/hedgewars-server/src/handlers.rs	Mon Dec 30 17:25:44 2019 +0300
@@ -270,8 +270,11 @@
                     LoginResult::Unchanged => (),
                     LoginResult::Complete => {
                         if let Some(client) = state.anteroom.remove_client(client_id) {
+                            let is_checker = client.is_checker;
                             state.server.add_client(client_id, client);
-                            common::get_lobby_join_data(&state.server, response);
+                            if !is_checker {
+                                common::get_lobby_join_data(&state.server, response);
+                            }
                         }
                     }
                     LoginResult::Exit => {