diff --git a/td/telegram/files/FileData.hpp b/td/telegram/files/FileData.hpp
index e3be9c763..f2ff55be2 100644
--- a/td/telegram/files/FileData.hpp
+++ b/td/telegram/files/FileData.hpp
@@ -80,7 +80,7 @@ void FileData::parse(ParserT &parser, bool register_file_sources) {
   PARSE_FLAG(encryption_key_is_secure);
   PARSE_FLAG(has_sources);
   PARSE_FLAG(has_version);
-  END_PARSE_FLAGS_GENERIC();
+  TRY_END_PARSE_FLAGS_GENERIC();
 
   int32 version = 0;
   if (has_version) {
diff --git a/tdutils/td/utils/tl_helpers.h b/tdutils/td/utils/tl_helpers.h
index f2dfeae08..33a5905c6 100644
--- a/tdutils/td/utils/tl_helpers.h
+++ b/tdutils/td/utils/tl_helpers.h
@@ -57,6 +57,15 @@
   }                                                                                                         \
   while (false)
 
+#define TRY_END_PARSE_FLAGS_GENERIC()                        \
+  CHECK(bit_offset_parse < 31);                              \
+  if ((flags_parse & ~((1 << bit_offset_parse) - 1)) != 0) { \
+    parser.set_error("invalid flags");                       \
+    return;                                                  \
+  }                                                          \
+  }                                                          \
+  while (false)
+
 namespace td {
 
 template <class StorerT>