From 2a336d9a5d71c1f99fdf9e36cd95499bcd6ef71f Mon Sep 17 00:00:00 2001
From: Naoyuki Sogo <sogo@longtail-software.co.jp>
Date: Fri, 28 Sep 2018 15:28:29 +0900
Subject: [PATCH 1/2] fix: #793

---
 lib/appenders/multiFile.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/appenders/multiFile.js b/lib/appenders/multiFile.js
index 98307e8..2e43bc5 100644
--- a/lib/appenders/multiFile.js
+++ b/lib/appenders/multiFile.js
@@ -60,6 +60,9 @@ module.exports.configure = (config, layouts) => {
 
   appender.shutdown = (cb) => {
     let shutdownFunctions = files.size;
+    if (shutdownFunctions <= 0) {
+      cb();
+    }
     let error;
     timers.forEach((timer) => {
       clearInterval(timer.interval);

From f066f19a2cc3d6f9fd8b4764e23225cc931856c6 Mon Sep 17 00:00:00 2001
From: Naoyuki Sogo <sogo@longtail-software.co.jp>
Date: Tue, 2 Oct 2018 09:24:54 +0900
Subject: [PATCH 2/2] test: multiFile appenders' shutdown called before use

---
 test/tap/multi-file-appender-test.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/test/tap/multi-file-appender-test.js b/test/tap/multi-file-appender-test.js
index 8b4826d..c3559e2 100644
--- a/test/tap/multi-file-appender-test.js
+++ b/test/tap/multi-file-appender-test.js
@@ -162,5 +162,24 @@ test('multiFile appender', (batch) => {
     });
   });
 
+  batch.test('should shutdown safely even if it is not used', (t) => {
+    log4js.configure({
+      appenders: {
+        out: { type: 'stdout' },
+        test: {
+          type: 'multiFile', base: 'logs/', property: 'categoryName', extension: '.log'
+        }
+      },
+      categories: {
+        default: { appenders: ['out'], level: 'info' },
+        test: { appenders: ['test'], level: 'debug' }
+      }
+    });
+    log4js.shutdown(() => {
+      t.ok('callback is called');
+      t.end();
+    });
+  });
+
   batch.end();
 });