diff --git a/td/telegram/SequenceDispatcher.cpp b/td/telegram/SequenceDispatcher.cpp
index a54443d9c..cfc92e9df 100644
--- a/td/telegram/SequenceDispatcher.cpp
+++ b/td/telegram/SequenceDispatcher.cpp
@@ -314,7 +314,7 @@ class MultiSequenceDispatcherNewImpl final : public MultiSequenceDispatcherNew {
   bool check_timeout(TaskId task_id) {
     auto &node = *scheduler_.get_task_extra(task_id);
     NetQueryPtr &net_query = node.net_query;
-    if (net_query->is_ready()) {
+    if (net_query.empty() || net_query->is_ready()) {
       return false;
     }
     net_query->total_timeout_ += node.total_timeout;
@@ -340,9 +340,9 @@ class MultiSequenceDispatcherNewImpl final : public MultiSequenceDispatcherNew {
       auto tl_constructor = query->tl_constructor();
       scheduler_.for_each_dependent(task_id, [&](TaskId child_task_id) {
         auto &child_node = *scheduler_.get_task_extra(child_task_id);
-        if (node.net_query_ref->tl_constructor() == tl_constructor) {
-          node.total_timeout += query->last_timeout_;
-          node.last_timeout = query->last_timeout_;
+        if (child_node.net_query_ref->tl_constructor() == tl_constructor) {
+          child_node.total_timeout += query->last_timeout_;
+          child_node.last_timeout = query->last_timeout_;
           to_check_timeout.push_back(child_task_id);
         }
       });
diff --git a/td/telegram/SequenceDispatcher.h b/td/telegram/SequenceDispatcher.h
index c5dafca73..5785d15fa 100644
--- a/td/telegram/SequenceDispatcher.h
+++ b/td/telegram/SequenceDispatcher.h
@@ -100,6 +100,6 @@ class MultiSequenceDispatcherNew : public NetQueryCallback {
   static ActorOwn<MultiSequenceDispatcherNew> create(Slice name);
 };
 
-using MultiSequenceDispatcher = MultiSequenceDispatcherOld;
+using MultiSequenceDispatcher = MultiSequenceDispatcherNew;
 
 }  // namespace td
diff --git a/tdutils/td/utils/ChainScheduler.h b/tdutils/td/utils/ChainScheduler.h
index 4e468fe97..2f2808767 100644
--- a/tdutils/td/utils/ChainScheduler.h
+++ b/tdutils/td/utils/ChainScheduler.h
@@ -17,6 +17,7 @@
 
 #include <functional>
 #include <map>
+#include <set>
 
 namespace td {
 
@@ -342,6 +343,7 @@ void ChainScheduler<ExtraT>::pause_task(TaskId task_id) {
   CHECK(task);
   inactivate_task(task_id, true);
   task->state = Task::State::Paused;
+  flush_try_start_task();
 }
 
 template <class ExtraT>