diff --git a/td/telegram/StateManager.cpp b/td/telegram/StateManager.cpp
index 7a1c1cc97..69901cc34 100644
--- a/td/telegram/StateManager.cpp
+++ b/td/telegram/StateManager.cpp
@@ -68,6 +68,7 @@ void StateManager::add_callback(unique_ptr<Callback> callback) {
     callbacks_.push_back(std::move(callback));
   }
 }
+
 void StateManager::wait_first_sync(Promise<> promise) {
   if (was_sync_) {
     return promise.set_value(Unit());
diff --git a/td/telegram/net/Session.cpp b/td/telegram/net/Session.cpp
index 4610159fa..d594bba83 100644
--- a/td/telegram/net/Session.cpp
+++ b/td/telegram/net/Session.cpp
@@ -333,12 +333,14 @@ void Session::on_network(bool network_flag, uint32 network_generation) {
 }
 
 void Session::on_online(bool online_flag) {
+  LOG(DEBUG) << "Set online flag to " << online_flag;
   online_flag_ = online_flag;
   connection_online_update(true);
   loop();
 }
 
 void Session::on_logging_out(bool logging_out_flag) {
+  LOG(DEBUG) << "Set logging out flag to " << logging_out_flag;
   logging_out_flag_ = logging_out_flag;
   connection_online_update(true);
   loop();
diff --git a/td/telegram/net/Session.h b/td/telegram/net/Session.h
index 6dba9fcfd..3eb61fee4 100644
--- a/td/telegram/net/Session.h
+++ b/td/telegram/net/Session.h
@@ -104,17 +104,17 @@ class Session final
   // Just re-ask answer_id each time we get information about it.
   // Though mtproto::Connection must ensure delivery of such query.
 
-  int32 raw_dc_id_;  // numerical datacenter ID, i.e. 2
-  int32 dc_id_;      // unique datacenter ID, i.e. -10002
-  enum class Mode : int8 { Tcp, Http } mode_ = Mode::Tcp;
-  bool is_main_;  // true only for the primary Session(s) to the main DC
-  bool is_cdn_;
-  bool need_destroy_;
+  const int32 raw_dc_id_;  // numerical datacenter ID, i.e. 2
+  const int32 dc_id_;      // unique datacenter ID, i.e. -10002
+  const bool is_main_;     // true only for the primary Session(s) to the main DC
+  const bool is_cdn_;
+  const bool need_destroy_;
   bool was_on_network_ = false;
   bool network_flag_ = false;
   bool online_flag_ = false;
   bool logging_out_flag_ = false;
   bool connection_online_flag_ = false;
+  enum class Mode : int8 { Tcp, Http } mode_ = Mode::Tcp;
   uint32 network_generation_ = 0;
   uint64 being_binded_tmp_auth_key_id_ = 0;
   uint64 being_checked_main_auth_key_id_ = 0;