diff --git a/renderdoc/serialise/serialiser.cpp b/renderdoc/serialise/serialiser.cpp
index 1f31f9bd4..06224596f 100644
--- a/renderdoc/serialise/serialiser.cpp
+++ b/renderdoc/serialise/serialiser.cpp
@@ -342,8 +342,9 @@ template <>
 uint32_t Serialiser<SerialiserMode::Writing>::BeginChunk(uint32_t chunkID, uint64_t byteLength)
 {
   // cannot start a chunk inside a chunk
-  RDCASSERTMSG("Beginning a chunk inside another chunk", m_Write->GetOffset() == 0,
-               m_Write->GetOffset());
+  RDCASSERTMSG("Beginning a chunk inside another chunk", m_ChunkMetadata.chunkID == 0,
+               m_ChunkMetadata.chunkID);
+
   {
     // chunk index needs to be valid
     RDCASSERT(chunkID > 0);