From 7aaad5ca156e9b2b74c08e4ca62d415a41273d23 Mon Sep 17 00:00:00 2001
From: Andrew Thompson <andrew@hijacked.us>
Date: Sat, 2 Feb 2019 16:46:42 -0800
Subject: [PATCH] Handle log messages with no format arguments

---
 src/lager_transform.erl | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/lager_transform.erl b/src/lager_transform.erl
index f248580..c8b5d31 100644
--- a/src/lager_transform.erl
+++ b/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.