Client: bugfix

GitOrigin-RevId: 0267cb2475fecae85d85f03abc96215762dc46e0

Author: arseny30

Diff for: td/telegram/Client.cpp

@@ -127,6 +127,7 @@ class ClientManager::Impl final {
         response.object->get_id() == td_api::updateAuthorizationState::ID &&
         static_cast<const td_api::updateAuthorizationState *>(response.object.get())->authorization_state_->get_id() ==
             td_api::authorizationStateClosed::ID) {
+      auto guard = concurrent_scheduler_->get_main_guard();
       auto it = tds_.find(response.client_id);
       CHECK(it != tds_.end());
       it->second.reset();