diff --git a/td/telegram/CallActor.cpp b/td/telegram/CallActor.cpp
index 7334110d..ae6ee98d 100644
--- a/td/telegram/CallActor.cpp
+++ b/td/telegram/CallActor.cpp
@@ -291,6 +291,7 @@ Status CallActor::do_update_call(telegram_api::phoneCallRequested &call) {
   LOG(DEBUG) << "Do update call to Requested";
   call_id_ = call.id_;
   call_access_hash_ = call.access_hash_;
+  is_call_id_inited_ = true;
   call_admin_id_ = call.admin_id_;
   call_participant_id_ = call.participant_id_;
   if (call_id_promise_) {
@@ -310,7 +311,7 @@ Status CallActor::do_update_call(telegram_api::phoneCallRequested &call) {
 }
 
 tl_object_ptr<telegram_api::inputPhoneCall> CallActor::get_input_phone_call() {
-  CHECK(call_id_ != 0);
+  CHECK(is_call_id_inited_);
   return make_tl_object<telegram_api::inputPhoneCall>(call_id_, call_access_hash_);
 }
 
diff --git a/td/telegram/CallActor.h b/td/telegram/CallActor.h
index b516c92a..17014fdc 100644
--- a/td/telegram/CallActor.h
+++ b/td/telegram/CallActor.h
@@ -118,6 +118,7 @@ class CallActor : public NetQueryCallback {
 
   CallId local_call_id_;
   int64 call_id_{0};
+  bool is_call_id_inited_{false};
   int64 call_access_hash_{0};
   int32 call_admin_id_{0};
   int32 call_participant_id_{0};