Index: include/llvm/DebugInfo/MSF/ByteStream.h
===================================================================
--- include/llvm/DebugInfo/MSF/ByteStream.h
+++ include/llvm/DebugInfo/MSF/ByteStream.h
@@ -97,7 +97,8 @@
       return make_error<MSFError>(msf_error_code::insufficient_buffer);
 
     uint8_t *DataPtr = const_cast<uint8_t *>(Data.data());
-    ::memcpy(DataPtr + Offset, Buffer.data(), Buffer.size());
+    if (!Buffer.empty())
+      ::memcpy(DataPtr + Offset, Buffer.data(), Buffer.size());
     return Error::success();
   }