diff --git a/td/telegram/net/NetQuery.cpp b/td/telegram/net/NetQuery.cpp
index 851a9bdb3..10a8c5992 100644
--- a/td/telegram/net/NetQuery.cpp
+++ b/td/telegram/net/NetQuery.cpp
@@ -38,6 +38,21 @@ int32 NetQuery::tl_magic(const BufferSlice &buffer_slice) {
   return as<int32>(slice.begin());
 }
 
+void NetQuery::set_error(Status status, string source) {
+  if (status.code() == Error::Resend || status.code() == Error::Cancelled ||
+      status.code() == Error::ResendInvokeAfter) {
+    return set_error_impl(Status::Error(200, PSLICE() << status), std::move(source));
+  }
+
+  if (status.message() == "INPUT_METHOD_INVALID") {
+    LOG(ERROR) << "Receive INPUT_METHOD_INVALID for query " << format::as_hex_dump<4>(Slice(query_.as_slice()));
+  }
+  if (status.message() == "BOT_METHOD_INVALID") {
+    LOG(ERROR) << "Receive BOT_METHOD_INVALID for query " << format::as_hex(tl_constructor());
+  }
+  set_error_impl(std::move(status), std::move(source));
+}
+
 void dump_pending_network_queries() {
   auto n = NetQueryCounter::get_count();
   LOG(WARNING) << tag("pending net queries", n);
diff --git a/td/telegram/net/NetQuery.h b/td/telegram/net/NetQuery.h
index ba19d8e72..a2df1af7b 100644
--- a/td/telegram/net/NetQuery.h
+++ b/td/telegram/net/NetQuery.h
@@ -133,13 +133,7 @@ class NetQuery : public ListNode {
   void on_net_write(size_t size);
   void on_net_read(size_t size);
 
-  void set_error(Status status, string source = "") {
-    if (status.code() == Error::Resend || status.code() == Error::Cancelled ||
-        status.code() == Error::ResendInvokeAfter) {
-      return set_error_impl(Status::Error(200, PSLICE() << status), std::move(source));
-    }
-    set_error_impl(std::move(status), source);
-  }
+  void set_error(Status status, string source = "");
 
   void set_error_resend() {
     set_error_impl(Status::Error<Error::Resend>());
diff --git a/td/telegram/net/NetQueryCreator.cpp b/td/telegram/net/NetQueryCreator.cpp
index d95deb1eb..541bbfaae 100644
--- a/td/telegram/net/NetQueryCreator.cpp
+++ b/td/telegram/net/NetQueryCreator.cpp
@@ -23,8 +23,7 @@ NetQueryCreator::Ptr NetQueryCreator::create(uint64 id, const Storer &storer, Dc
   int32 tl_constructor = NetQuery::tl_magic(slice);
   if (gzip_flag == NetQuery::GzipFlag::On) {
     // TODO: try to compress files?
-    BufferSlice compressed;
-    compressed = gzencode(slice.as_slice());
+    BufferSlice compressed = gzencode(slice.as_slice());
     if (compressed.empty()) {
       gzip_flag = NetQuery::GzipFlag::Off;
     } else {