PB socket error on bucket props

case_catch.erl

decode_modfun(#rpbmodfun{module=Mod, function=Fun}=MF, _Prop) ->
    case (catch {binary_to_existing_atom(Mod, latin1), binary_to_existing_atom(Fun, latin1)}) of
        {'EXIT', {badarg, _}} ->
            error_logger:warning_msg("Creating new atoms from protobuffs message! ~p", [MF]),
            {binary_to_atom(Mod, latin1), binary_to_atom(Fun, latin1)};
        {M,F} -> {M,F}
    end.

gistfile1.txt

Eshell V5.9.2  (abort with ^G)
1>  {ok, Pid} = riakc_pb_socket:start_link("127.0.0.1", 8087).
{ok,<0.33.0>}
2> riakc_pb_socket:p
ping/1  ping/2  put/2   put/3   put/4   
2> riakc_pb_socket:ping(Pid).
pong
3> riakc_pb_socket:get_bucket(Pid, <<"bob">>).

=ERROR REPORT==== 27-Feb-2013::17:20:24 ===
** Generic server <0.33.0> terminating 
** Last message in was {tcp,#Port<0.1167>,
                            [20|
                             <<10,133,1,8,3,16,0,24,0,50,34,10,14,114,105,97,
                               107,95,99,111,114,101,95,117,116,105,108,18,
                               16,99,104,97,115,104,95,115,116,100,95,107,
                               101,121,102,117,110,58,43,10,22,114,105,97,
                               107,95,107,118,95,119,109,95,108,105,110,107,
                               95,119,97,108,107,101,114,18,17,109,97,112,
                               114,101,100,117,99,101,95,108,105,110,107,102,
                               117,110,64,128,163,5,72,20,80,50,88,50,96,0,
                               104,253,255,255,255,15,112,253,255,255,255,15,
                               120,0,128,1,253,255,255,255,15,136,1,253,255,
                               255,255,15,144,1,0,152,1,1>>]}
** When Server state == {state,"127.0.0.1",8087,false,false,#Port<0.1167>,
                            {request,#Ref<0.0.0.43>,
                                {rpbgetbucketreq,<<"bob">>},
                                {<0.31.0>,#Ref<0.0.0.42>},
                                undefined,60000,#Ref<0.0.0.44>},
                            {[],[]},
                            1,[],infinity,100}
** Reason for termination == 
** {badarg,[{erlang,binary_to_existing_atom,[<<"riak_core_util">>,latin1],[]},
            {riak_pb_codec,decode_modfun,2,
                           [{file,"src/riak_pb_codec.erl"},{line,358}]},
            {riak_pb_codec,'-decode_bucket_props/1-lc$^1/1-1-',2,
                           [{file,"src/riak_pb_codec.erl"},{line,263}]},
            {riak_pb_codec,decode_bucket_props,1,
                           [{file,"src/riak_pb_codec.erl"},{line,263}]},
            {riakc_pb_socket,process_response,3,
                             [{file,"src/riakc_pb_socket.erl"},{line,1120}]},
            {riakc_pb_socket,handle_info,2,
                             [{file,"src/riakc_pb_socket.erl"},{line,847}]},
            {gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,607}]},
            {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,227}]}]}
** exception exit: badarg
     in function  binary_to_existing_atom/2
        called as binary_to_existing_atom(<<"riak_core_util">>,latin1)
     in call from riak_pb_codec:decode_modfun/2 (src/riak_pb_codec.erl, line 358)
     in call from riak_pb_codec:'-decode_bucket_props/1-lc$^1/1-1-'/2 (src/riak_pb_codec.erl, line 263)
     in call from riak_pb_codec:decode_bucket_props/1 (src/riak_pb_codec.erl, line 263)
     in call from riakc_pb_socket:process_response/3 (src/riakc_pb_socket.erl, line 1120)
     in call from riakc_pb_socket:handle_info/2 (src/riakc_pb_socket.erl, line 847)
     in call from gen_server:handle_msg/5 (gen_server.erl, line 607)
     in call from proc_lib:init_p_do_apply/3 (proc_lib.erl, line 227)