From 237a4842dea35eb6a6797db1dfc252e2de714897 Mon Sep 17 00:00:00 2001
From: Girish Ramakrishnan <girish@cloudron.io>
Date: Thu, 15 Oct 2015 14:25:38 -0700
Subject: [PATCH] callback can be null

---
 src/janitor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/janitor.js b/src/janitor.js
index e61b2c021..f6be119c8 100644
--- a/src/janitor.js
+++ b/src/janitor.js
@@ -87,7 +87,7 @@ function cleanupTmpVolume(containerId, callback) {
 }
 
 function cleanupDockerVolumes(callback) {
-    assert.strictEqual(typeof callback, 'function');
+    assert(!callback || typeof callback === 'function'); // callback is null when called from cronjob
 
     debug('Cleaning up docker volumes');