diff --git a/td/telegram/net/ConnectionCreator.cpp b/td/telegram/net/ConnectionCreator.cpp
index 480df4f0d..287826815 100644
--- a/td/telegram/net/ConnectionCreator.cpp
+++ b/td/telegram/net/ConnectionCreator.cpp
@@ -212,7 +212,7 @@ void Proxy::parse(T &parser) {
     parse(port_, parser);
     parse(secret_, parser);
   } else {
-    CHECK(type_ == Proxy::Type::None);
+    CHECK(type_ == Proxy::Type::None) << static_cast<int32>(type_);
   }
 }
 
diff --git a/tdutils/td/utils/tl_parsers.cpp b/tdutils/td/utils/tl_parsers.cpp
index 534e7793c..3f7f78ff8 100644
--- a/tdutils/td/utils/tl_parsers.cpp
+++ b/tdutils/td/utils/tl_parsers.cpp
@@ -21,7 +21,8 @@ void TlParser::set_error(const string &error_message) {
   } else {
     data = empty_data;
     CHECK(error_pos != std::numeric_limits<size_t>::max());
-    CHECK(data_len == 0);
+    CHECK(data_len == 0) << data_len << " " << left_len << " " << data << " " << &empty_data[0] << " " << error_pos
+                         << " " << error;
     CHECK(left_len == 0);
   }
 }