diff --git a/src/machi_cr_client.erl b/src/machi_cr_client.erl
index 786fe2c..0ce0787 100644
--- a/src/machi_cr_client.erl
+++ b/src/machi_cr_client.erl
@@ -519,6 +519,8 @@ do_read_chunk2(File, Offset, Size, Depth, STime, TO,
         {ok, BadChunk} ->
             exit({todo, bad_chunk_size, ?MODULE, ?LINE, File, Offset, Size,
                   got, byte_size(BadChunk)});
+        {error, bad_arg} = BadArg -> 
+            {reply, BadArg, S};
         {error, partial_read}=Err ->
             {reply, Err, S};
         {error, bad_checksum}=BadCS ->