Merge pull request #4642 from rickard-von-essen/issue-4635

amazon: Step Region Copy crashing on device mapping

builder/amazon/common/step_ami_region_copy.go

@@ -2,7 +2,6 @@ package common
 
 import (
 	"fmt"
-
 	"sync"
 
 	"github.com/aws/aws-sdk-go/aws"
@@ -128,7 +127,7 @@ func amiRegionCopy(state multistep.StateBag, config *AccessConfig, name string,
 	}
 
 	for _, blockDeviceMapping := range describeImageResp.Images[0].BlockDeviceMappings {
-		if blockDeviceMapping.Ebs != nil {
+		if blockDeviceMapping.Ebs != nil && blockDeviceMapping.Ebs.SnapshotId != nil {
 			snapshotIds = append(snapshotIds, *blockDeviceMapping.Ebs.SnapshotId)
 		}
 	}