diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 257bacaf3..0ba73140b 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -2603,6 +2603,10 @@ void ContactsManager::Chat::parse(ParserT &parser) {
     parse(status, parser);
     parse(default_permissions, parser);
   } else {
+    if (can_edit != (is_creator || is_administrator || everyone_is_administrator)) {
+      LOG(ERROR) << "Have wrong can_edit flag";
+    }
+
     if (kicked || !is_active) {
       status = DialogParticipantStatus::Banned(0);
     } else if (left) {
diff --git a/td/telegram/files/FileLocation.h b/td/telegram/files/FileLocation.h
index 10dafe7f3..879822aae 100644
--- a/td/telegram/files/FileLocation.h
+++ b/td/telegram/files/FileLocation.h
@@ -409,9 +409,8 @@ class FullRemoteFileLocation {
                 return make_tl_object<telegram_api::inputDocumentFileLocation>(
                     photo().id_, photo().access_hash_, BufferSlice(file_reference_),
                     std::string(1, static_cast<char>(narrow_cast<uint8>(thumbnail.thumbnail_type))));
-              default:
-                break;
             }
+            break;
           }
           case PhotoSizeSource::Type::DialogPhotoSmall:
           case PhotoSizeSource::Type::DialogPhotoBig: {
diff --git a/td/telegram/files/FileManager.cpp b/td/telegram/files/FileManager.cpp
index 6a6ca7365..98a458efa 100644
--- a/td/telegram/files/FileManager.cpp
+++ b/td/telegram/files/FileManager.cpp
@@ -2566,7 +2566,7 @@ string FileManager::get_persistent_id(const FullRemoteFileLocation &location) {
   auto binary = serialize(location_copy);
 
   binary = zero_encode(binary);
-  binary.push_back(narrow_cast<td::uint8>(Version::Next) - 1);
+  binary.push_back(static_cast<char>(narrow_cast<td::uint8>(Version::Next) - 1));
   binary.push_back(PERSISTENT_ID_VERSION);
   return base64url_encode(binary);
 }
@@ -2660,7 +2660,7 @@ Result<FileId> FileManager::from_persistent_id_v3(Slice binary, FileType file_ty
   if (binary.empty()) {
     return Status::Error("Invalid remote id");
   }
-  auto version = static_cast<uint8>(binary.back());
+  int32 version = static_cast<uint8>(binary.back());
   binary.remove_suffix(1);
   return from_persistent_id_v23(binary, file_type, version);
 }