diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 00165411e..36e27287e 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -1572,6 +1572,12 @@ class ExportChatInviteLinkQuery : public Td::ResultHandler {
     LOG(INFO) << "Receive result for ExportChatInviteQuery: " << to_string(ptr);
 
     DialogInviteLink invite_link(std::move(ptr));
+    if (!invite_link.is_valid()) {
+      return on_error(id, Status::Error(500, "Receive invalid invite link"));
+    }
+    if (invite_link.get_administrator_user_id() != td->contacts_manager_->get_my_id()) {
+      return on_error(id, Status::Error(500, "Receive invalid invite link creator"));
+    }
     promise_.set_value(invite_link.get_chat_invite_link_object(td->contacts_manager_.get()));
   }
 
@@ -1623,6 +1629,9 @@ class EditChatInviteLinkQuery : public Td::ResultHandler {
     td->contacts_manager_->on_get_users(std::move(result->users_), "EditChatInviteLinkQuery");
 
     DialogInviteLink invite_link(std::move(result->invite_));
+    if (!invite_link.is_valid()) {
+      return on_error(id, Status::Error(500, "Receive invalid invite link"));
+    }
     promise_.set_value(invite_link.get_chat_invite_link_object(td->contacts_manager_.get()));
   }
 
diff --git a/td/telegram/DialogInviteLink.cpp b/td/telegram/DialogInviteLink.cpp
index e3441bd55..e1ea483cf 100644
--- a/td/telegram/DialogInviteLink.cpp
+++ b/td/telegram/DialogInviteLink.cpp
@@ -29,12 +29,24 @@ DialogInviteLink::DialogInviteLink(tl_object_ptr<telegram_api::chatInviteExporte
   }
   if ((exported_invite->flags_ & telegram_api::chatInviteExported::EXPIRE_DATE_MASK) != 0) {
     expire_date_ = exported_invite->expire_date_;
+    if (expire_date_ < 0) {
+      LOG(ERROR) << "Receive wrong date " << expire_date_ << " as expire date of a link " << invite_link_;
+      expire_date_ = 0;
+    }
   }
   if ((exported_invite->flags_ & telegram_api::chatInviteExported::USAGE_LIMIT_MASK) != 0) {
     usage_limit_ = exported_invite->usage_limit_;
+    if (usage_limit_ < 0) {
+      LOG(ERROR) << "Receive wrong usage limit " << usage_limit_ << " for a link " << invite_link_;
+      usage_limit_ = 0;
+    }
   }
   if ((exported_invite->flags_ & telegram_api::chatInviteExported::USAGE_MASK) != 0) {
     usage_count_ = exported_invite->usage_;
+    if (usage_count_ < 0) {
+      LOG(ERROR) << "Receive wrong usage count " << usage_count_ << " for a link " << invite_link_;
+      usage_count_ = 0;
+    }
   }
 }