Server error during processing error

Hi Community member!

Question!!!
What is the cause of the error

Server error during processing: [“web request failed”,
{path,
"/pools/default/buckets/planet_o/stats"},
{type,error},
{what,badarith},
{trace,
[{menelaus_stats,
’-computed_stats_lazy_proplist/0-fun-8-’,
2},
{lists,zipwith,3},
{menelaus_stats,
’-samples_to_proplists/1-fun-3-’,2},
{lists,map,2},
{menelaus_stats,samples_to_proplists,1},
{menelaus_stats,
build_buckets_stats_ops_response,4},
{menelaus_stats,handle_buckets_stats,3},
{menelaus_web_buckets,
checking_bucket_access,4}]}]