From 92f664614b192d3e7aef816f52c485e8b65a2a5f Mon Sep 17 00:00:00 2001
From: Andrea Cavalli <andrea@cavallium.it>
Date: Sun, 28 Mar 2021 12:50:00 +0200
Subject: [PATCH] Fix #18

---
 td/telegram/PollManager.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/td/telegram/PollManager.cpp b/td/telegram/PollManager.cpp
index 246139985..5d7a2e183 100644
--- a/td/telegram/PollManager.cpp
+++ b/td/telegram/PollManager.cpp
@@ -1177,8 +1177,12 @@ void PollManager::on_update_poll_timeout(PollId poll_id) {
   if (G()->close_flag()) {
     return;
   }
+
   auto poll = get_poll(poll_id);
-  if (!(poll != nullptr)) return;
+  if (poll == nullptr) {
+    return;
+  }
+
   if (poll->is_closed && poll->is_updated_after_close) {
     return;
   }
@@ -1192,7 +1196,13 @@ void PollManager::on_update_poll_timeout(PollId poll_id) {
     return;
   }
 
-  auto full_message_id = *it->second.begin();
+  auto full_message_id_set = std::move(it->second);
+  if (full_message_id_set.empty()) {
+    return;
+  }
+
+  auto full_message_id = *full_message_id_set.begin();
+
   LOG(INFO) << "Fetching results of " << poll_id << " from " << full_message_id;
   auto query_promise = PromiseCreator::lambda([poll_id, generation = current_generation_, actor_id = actor_id(this)](
                                                   Result<tl_object_ptr<telegram_api::Updates>> &&result) {