no stack from formatter

app/controllers/scores_controller.rb

@@ -9,6 +9,7 @@ class ScoresController < ApplicationController
     logger.warn 'this is a warning'
     logger.error 'this is an error'
     logger.debug 'this is a debug message'
+    logger.fatal 'FATAL'
     logger.info @scores
   end
 

lib/formatter/colored_formatter.rb

@@ -3,7 +3,8 @@ require 'rainbow'
 # ColoredFormatter outputs colored message according to severity
 class ColoredFormatter < Logger::Formatter
   def call(severity, _time, _program_name, message) # rubocop:disable Metrics/MethodLength
-    msg = message.is_a?(String) ? message : message.inspect
+    # msg = message.is_a?(String) ? message : message.inspect
+    msg = message
     tint = case severity
            when 'DEBUG'
              :darkgray