diff --git a/td/telegram/SecretChatsManager.cpp b/td/telegram/SecretChatsManager.cpp
index 19ba726e7..9e4036827 100644
--- a/td/telegram/SecretChatsManager.cpp
+++ b/td/telegram/SecretChatsManager.cpp
@@ -506,6 +506,7 @@ ActorId<SecretChatActor> SecretChatsManager::create_chat_actor_impl(int32 id, bo
     return it_flag.first->second.get();
   }
 }
+
 void SecretChatsManager::on_qts_ack(PtsManager::PtsId qts_ack_token) {
   auto old_qts = qts_manager_.db_pts();
   auto new_qts = qts_manager_.finish(qts_ack_token);
diff --git a/td/tl/tl_json.h b/td/tl/tl_json.h
index a90634da3..1ff559a32 100644
--- a/td/tl/tl_json.h
+++ b/td/tl/tl_json.h
@@ -88,7 +88,7 @@ inline Status from_json(int32 &to, JsonValue &from) {
 
 inline Status from_json(bool &to, JsonValue &from) {
   if (from.type() != JsonValue::Type::Boolean) {
-    int32 x;
+    int32 x = 0;
     auto status = from_json(x, from);
     if (status.is_ok()) {
       to = x != 0;
diff --git a/tdactor/test/actors_main.cpp b/tdactor/test/actors_main.cpp
index 976adf441..5ba3b1987 100644
--- a/tdactor/test/actors_main.cpp
+++ b/tdactor/test/actors_main.cpp
@@ -486,7 +486,7 @@ class XContext : public ActorContext {
 class WithXContext : public Actor {
  public:
   void start_up() override {
-    set_context(std::make_shared<XContext>());
+    auto old_context = set_context(std::make_shared<XContext>());
   }
   void f(unique_ptr<Guard> guard) {
   }
diff --git a/tdutils/td/utils/ConcurrentHashTable.h b/tdutils/td/utils/ConcurrentHashTable.h
index 96a16ed5d..14db1d1e3 100644
--- a/tdutils/td/utils/ConcurrentHashTable.h
+++ b/tdutils/td/utils/ConcurrentHashTable.h
@@ -109,7 +109,7 @@ class ConcurrentHashMap {
   ConcurrentHashMap(ConcurrentHashMap &&) = delete;
   ConcurrentHashMap &operator=(ConcurrentHashMap &&) = delete;
   ~ConcurrentHashMap() {
-    unique_ptr<HashMap>(hash_map_.load());
+    unique_ptr<HashMap>(hash_map_.load()).reset();
   }
 
   static std::string get_name() {
diff --git a/tdutils/td/utils/tl_parsers.h b/tdutils/td/utils/tl_parsers.h
index 1a6722259..e730e26ec 100644
--- a/tdutils/td/utils/tl_parsers.h
+++ b/tdutils/td/utils/tl_parsers.h
@@ -156,7 +156,8 @@ class TlParser {
       data += sizeof(int32);
     } else {
       check_len(sizeof(int32));
-      auto result_len_uint64 = data[1] + (data[2] << 8) + (data[3] << 16) + (data[4] << 24) +
+      auto result_len_uint64 = static_cast<uint64>(data[1]) + (static_cast<uint64>(data[2]) << 8) +
+                               (static_cast<uint64>(data[3]) << 16) + (static_cast<uint64>(data[4]) << 24) +
                                (static_cast<uint64>(data[5]) << 32) + (static_cast<uint64>(data[6]) << 40) +
                                (static_cast<uint64>(data[7]) << 48);
       if (result_len_uint64 > std::numeric_limits<size_t>::max() - 3) {
diff --git a/tdutils/test/log.cpp b/tdutils/test/log.cpp
index ac26b81a7..4d2762218 100644
--- a/tdutils/test/log.cpp
+++ b/tdutils/test/log.cpp
@@ -76,7 +76,7 @@ TEST(Log, TsLogger) {
     class FileLog : public td::LogInterface {
      public:
       FileLog() {
-        file_log_.init("tmplog", std::numeric_limits<td::int64>::max(), false);
+        file_log_.init("tmplog", std::numeric_limits<td::int64>::max(), false).ensure();
         ts_log_.init(&file_log_);
       }
       ~FileLog() {
@@ -108,7 +108,7 @@ TEST(Log, TsLogger) {
     class FileLog : public td::LogInterface {
      public:
       FileLog() {
-        file_log_.init("tmplog", std::numeric_limits<td::int64>::max(), false);
+        file_log_.init("tmplog", std::numeric_limits<td::int64>::max(), false).ensure();
       }
       ~FileLog() {
       }
diff --git a/test/secret.cpp b/test/secret.cpp
index cab74359f..aa8c10750 100644
--- a/test/secret.cpp
+++ b/test/secret.cpp
@@ -757,7 +757,7 @@ class Master : public Actor {
     return get_by_id(3 - get_link_token());
   }
   void start_up() override {
-    set_context(std::make_shared<Global>());
+    auto old_context = set_context(std::make_shared<Global>());
     alice_ = create_actor<SecretChatProxy>("SecretChatProxy alice", "alice", actor_shared(this, 1));
     bob_ = create_actor<SecretChatProxy>("SecretChatProxy bob", "bob", actor_shared(this, 2));
     send_closure(alice_->get_actor_unsafe()->actor_, &SecretChatActor::create_chat, 2, 0, 123,
diff --git a/test/tdclient.cpp b/test/tdclient.cpp
index caf8242a3..d88d4a265 100644
--- a/test/tdclient.cpp
+++ b/test/tdclient.cpp
@@ -142,7 +142,7 @@ class TestClient : public Actor {
 
   void start_up() override {
     rmrf(name_).ignore();
-    set_context(std::make_shared<td::ActorContext>());
+    auto old_context = set_context(std::make_shared<td::ActorContext>());
     set_tag(name_);
     LOG(INFO) << "START UP!";