Handle log messages with no format arguments

src/lager_transform.erl

@@ -192,8 +192,16 @@ do_transform(Line, SinkName, Severity, Arguments0, Safety) ->
     {Meta, Message, Arguments} = handle_args(DefaultAttrs, Line, Arguments0),
     case get(use_logger) of
         true ->
-            {call,Line,{remote, Line, {atom, Line, logger}, {atom, Line, log}},
-             [{atom,Line,Severity}, Message, Arguments, {call, Line, {remote, Line, {atom, Line, maps}, {atom, Line, from_list}}, [Meta]}]};
+            case Arguments of
+                {atom, _, none} ->
+                    %% logger:log(Level, Format, Args, Metadata)
+                    {call,Line,{remote, Line, {atom, Line, logger}, {atom, Line, log}},
+                     [{atom,Line,Severity}, Message, Arguments, {call, Line, {remote, Line, {atom, Line, maps}, {atom, Line, from_list}}, [Meta]}]};
+                _ ->
+                    %% logger:log(Level, String, Metadata)
+                    {call,Line,{remote, Line, {atom, Line, logger}, {atom, Line, log}},
+                     [{atom,Line,Severity}, Message, {call, Line, {remote, Line, {atom, Line, maps}, {atom, Line, from_list}}, [Meta]}]}
+            end;
         false ->
             SeverityAsInt=lager_util:level_to_num(Severity),
             %% Generate some unique variable names so we don't accidentally export from case clauses.