diff --git a/src/encoding/block.cpp b/src/encoding/block.cpp
index fdeb043..0785ec0 100644
--- a/src/encoding/block.cpp
+++ b/src/encoding/block.cpp
@@ -226,6 +226,10 @@
       Tlv::writeVarNumber(os, value_size());
       os.write(reinterpret_cast<const char*>(value()), value_size());
     }
+  else if (m_subBlocks.size() == 0)
+    {
+      Tlv::writeVarNumber(os, 0);
+    }
   else
     {
       size_t valueSize = 0;