From 5df363a0f6493bb334572d9218448a8cc3b448ee Mon Sep 17 00:00:00 2001
From: Priya Wadhwa <priyawadhwa@google.com>
Date: Tue, 13 Nov 2018 10:12:03 -0800
Subject: [PATCH] Check if command is nil before optimizing

MAINTAINER returns nil since it's deprecated, so we should make sure we
don't add to the list of commands to optimize.
---
 pkg/executor/build.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/executor/build.go b/pkg/executor/build.go
index 0f9f3dd2d..e11c0fd53 100644
--- a/pkg/executor/build.go
+++ b/pkg/executor/build.go
@@ -155,6 +155,9 @@ func (s *stageBuilder) build() error {
 		if err != nil {
 			return err
 		}
+		if command == nil {
+			continue
+		}
 		cmds = append(cmds, command)
 	}