diff --git a/apps/efka/src/channel/ws_channel.erl b/apps/efka/src/channel/ws_channel.erl
index 38ea1e5..20875f3 100644
--- a/apps/efka/src/channel/ws_channel.erl
+++ b/apps/efka/src/channel/ws_channel.erl
@@ -244,12 +244,12 @@ search_stream_id(StreamPid, StreamMap) when is_pid(StreamPid), is_map(StreamMap)
 
 -spec map_metric(Metric :: any()) -> {ok, binary()} | error.
 map_metric(Metric) when is_binary(Metric) ->
-    Metric;
+    {ok, Metric};
 map_metric(Metric) when is_map(Metric) orelse is_list(Metric) ->
-    jiffy:encode(Metric, [force_utf8]);
+    {ok, jiffy:encode(Metric, [force_utf8])};
 map_metric(Metric) when is_integer(Metric) ->
-    integer_to_binary(Metric);
+    {ok, integer_to_binary(Metric)};
 map_metric(Metric) when is_float(Metric) ->
-    erlang:float_to_binary(Metric, [compact, {decimals, 10}]);
+    {ok, erlang:float_to_binary(Metric, [compact, {decimals, 10}])};
 map_metric(_) ->
     error.
\ No newline at end of file