Loading graph hangs on

On attempt to check statistics for test3membase bucket "Bytes recieved..." in Hour view, "Loading..." hangs on and exception generated. Graphic before switching had vertical wider than expected line.
Reproduced on Ubuntu.

Server error during processing: ["web request failed",

{path, "/pools/default/buckets/test3membase/stats"}

,

{type,error}

,

{what,badarith}

,
{trace,
[

{menelaus_stats, '-add_stat_sums/1-lc$^0/1-0-',1}

,

{menelaus_stats,add_stat_sums,1}

,

{menelaus_stats, build_buckets_stats_ops_response,3}

,

{menelaus_stats,handle_buckets_stats,3}

,

{menelaus_web_buckets, checking_bucket_access,4}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}]