diff --git a/td/telegram/RequestActor.h b/td/telegram/RequestActor.h
index 9e1e8f82f..f32a76242 100644
--- a/td/telegram/RequestActor.h
+++ b/td/telegram/RequestActor.h
@@ -30,13 +30,15 @@ class RequestActor : public Actor {
   }
 
   void loop() override {
-    PromiseActor<T> promise;
+    PromiseActor<T> promise_actor;
     FutureActor<T> future;
-    init_promise_future(&promise, &future);
+    init_promise_future(&promise_actor, &future);
 
-    do_run(PromiseCreator::from_promise_actor(std::move(promise)));
+    auto promise = PromiseCreator::from_promise_actor(std::move(promise_actor));
+    do_run(std::move(promise));
 
     if (future.is_ready()) {
+      CHECK(!promise);
       if (future.is_error()) {
         do_send_error(future.move_as_error());
       } else {
@@ -45,6 +47,9 @@ class RequestActor : public Actor {
       }
       stop();
     } else {
+      LOG_CHECK(!promise.was_set_value) << future.empty() << " " << future.get_state();
+      CHECK(!future.empty());
+      CHECK(future.get_state() == FutureActor<T>::State::Waiting);
       if (--tries_left_ == 0) {
         future.close();
         do_send_error(Status::Error(400, "Requested data is inaccessible"));
diff --git a/tdactor/td/actor/PromiseFuture.h b/tdactor/td/actor/PromiseFuture.h
index a8527d7d0..bd3f4b805 100644
--- a/tdactor/td/actor/PromiseFuture.h
+++ b/tdactor/td/actor/PromiseFuture.h
@@ -62,10 +62,12 @@ class SafePromise;
 template <class T = Unit>
 class Promise {
  public:
+  bool was_set_value{false};
   void set_value(T &&value) {
     if (!promise_) {
       return;
     }
+    was_set_value = true;
     promise_->set_value(std::move(value));
     promise_.reset();
   }
@@ -73,6 +75,7 @@ class Promise {
     if (!promise_) {
       return;
     }
+    was_set_value = true;
     promise_->set_error(std::move(error));
     promise_.reset();
   }
@@ -80,6 +83,7 @@ class Promise {
     if (!promise_) {
       return;
     }
+    was_set_value = true;
     promise_->set_result(std::move(result));
     promise_.reset();
   }
@@ -404,9 +408,9 @@ class PromiseActor final : public PromiseInterface<T> {
 template <class T>
 class FutureActor final : public Actor {
   friend class PromiseActor<T>;
+ public:
   enum State { Waiting, Ready };
 
- public:
   static constexpr int Hangup = 426487;
 
   FutureActor() = default;
@@ -457,6 +461,10 @@ class FutureActor final : public Actor {
     }
   }
 
+  State get_state() const {
+    return state_;
+  }
+
   template <class S>
   friend void init_promise_future(PromiseActor<S> *promise, FutureActor<S> *future);