From 8cfe1627c654b605d8c3090a531896af9ff19918 Mon Sep 17 00:00:00 2001
From: Cocoa <0xbbc@0xbbc.com>
Date: Sat, 9 May 2020 04:20:49 +0800
Subject: [PATCH] Only detects ANSI color codes for data in string type

Signed-off-by: Cocoa <0xbbc@0xbbc.com>
---
 lib/appenders/file.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/appenders/file.js b/lib/appenders/file.js
index 040dc8ee..9b00326f 100644
--- a/lib/appenders/file.js
+++ b/lib/appenders/file.js
@@ -56,7 +56,10 @@ function fileAppender(file, layout, logSize, numBackups, options, timezoneOffset
     if (options.removeColor === true) {
       // eslint-disable-next-line no-control-regex
       const regex = /\x1b[[0-9;]*m/g;
-      loggingEvent.data = loggingEvent.data.map(d => d.replace(regex, ''))
+      loggingEvent.data = loggingEvent.data.map(d => {
+        if (typeof d === 'string') return d.replace(regex, '')
+        else return d
+      })
     }
     if (!writer.write(layout(loggingEvent, timezoneOffset) + eol, "utf8")) {
       process.emit('log4js:pause', true);