From 77b4d47409e7be84d62a3d7154dcfee588b58e38 Mon Sep 17 00:00:00 2001
From: Matthew Hooker <mwhooker@gmail.com>
Date: Thu, 25 May 2017 14:16:20 -0700
Subject: [PATCH] only delete snapshots which exist

---
 builder/amazon/common/step_deregister_ami.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builder/amazon/common/step_deregister_ami.go b/builder/amazon/common/step_deregister_ami.go
index 139e2159c..7dc39e288 100644
--- a/builder/amazon/common/step_deregister_ami.go
+++ b/builder/amazon/common/step_deregister_ami.go
@@ -51,7 +51,7 @@ func (s *StepDeregisterAMI) Run(state multistep.StateBag) multistep.StepAction {
 			// Delete snapshot(s) by image
 			if s.ForceDeleteSnapshot {
 				for _, b := range i.BlockDeviceMappings {
-					if b.Ebs != nil {
+					if b.Ebs != nil && aws.StringValue(b.Ebs.SnapshotId) != "" {
 						_, err := ec2conn.DeleteSnapshot(&ec2.DeleteSnapshotInput{
 							SnapshotId: b.Ebs.SnapshotId,
 						})