From e9907122ed6d71de4601b0be22e39e4486636c69 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 8 Jul 2019 13:03:50 +0900
Subject: [PATCH] Suppress a warning when `write_headers: true`

---
 lib/csv/writer.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/csv/writer.rb b/lib/csv/writer.rb
index 8e0aab32ff..1682ac03ea 100644
--- a/lib/csv/writer.rb
+++ b/lib/csv/writer.rb
@@ -14,6 +14,7 @@ class CSV
       @output = output
       @options = options
       @lineno = 0
+      @fields_converter = nil
       prepare
       if @options[:write_headers] and @headers
         self << @headers