panic with nil map

gistfile1.txt

==> amazon-ebs: Stopping the source instance... 
    amazon-ebs: Stopping instance 
==> amazon-ebs: Waiting for the instance to stop... 
==> amazon-ebs: Creating AMI OAsX7vH from instance i-REDACTED 
    amazon-ebs: AMI: ami-REDACTED 
==> amazon-ebs: Waiting for AMI to become ready... 
==> amazon-ebs: Deregistering the AMI because cancellation, error or it was temporary (encrypt_boot was set)... 
==> amazon-ebs: Terminating the source AWS instance... 
==> amazon-ebs: Cleaning up any extra volumes... 
==> amazon-ebs: No volumes to clean up, skipping 
==> amazon-ebs: Deleting temporary security group... 
==> amazon-ebs: Deleting temporary keypair... 
Build 'amazon-ebs' errored: unexpected EOF 
 
==> Some builds didn't complete successfully and had errors: 
--> amazon-ebs: unexpected EOF 
 
==> Builds finished but no artifacts were created. 
2019/05/13 15:38:36 packer: panic: assignment to entry in nil map 
2019/05/13 15:38:36 packer:  
2019/05/13 15:38:36 packer: goroutine 124 [running]: 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/builder/amazon/common.(*StepAMIRegionCopy).Run(0xc0003840f0, 0x352f160, 0xc000328400, 0x350f5a0, 0xc00049d800, 0x0) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/builder/amazon/common/step_ami_region_copy.go:35 +0x2ad 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/helper/multistep.(*BasicRunner).Run(0xc00049d920, 0x352f160, 0xc000328400, 0x350f5a0, 0xc00049d800) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/helper/multistep/basic_runner.go:67 +0x1ec 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/builder/amazon/ebs.(*Builder).Run(0xc0000a0e00, 0x352f160, 0xc000328400, 0x353f860, 0xc0001ba380, 0x34d38e0, 0xc000038230, 0x40b919, 0xc00049d230, 0x30, ...) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/builder/amazon/ebs/builder.go:249 +0x12d0 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/packer/rpc.(*BuilderServer).Run(0xc0004557d0, 0x1, 0xc000566020, 0x0, 0x0) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/packer/rpc/builder.go:109 +0x231 
2019/05/13 15:38:36 packer: reflect.Value.call(0xc000096900, 0xc00000e0d8, 0x13, 0x2fdca52, 0x4, 0xc0000b0f18, 0x3, 0x3, 0xc0002fd040, 0x3, ...) 
2019/05/13 15:38:36 packer:     /usr/local/go/src/reflect/value.go:447 +0x461 
2019/05/13 15:38:36 packer: reflect.Value.Call(0xc000096900, 0xc00000e0d8, 0x13, 0xc000631718, 0x3, 0x3, 0xc000343a40, 0xc000631730, 0x404e35) 
2019/05/13 15:38:36 packer:     /usr/local/go/src/reflect/value.go:308 +0xa4 
2019/05/13 15:38:36 packer: net/rpc.(*service).call(0xc000092440, 0xc0000a81e0, 0xc000332260, 0xc000332270, 0xc000334500, 0xc0001ba0e0, 0x2744ac0, 0xc00056601c, 0x18a, 0x26b55a0, ...) 
2019/05/13 15:38:36 packer:     /usr/local/go/src/net/rpc/server.go:384 +0x14e 
2019/05/13 15:38:36 packer: created by net/rpc.(*Server).ServeCodec 
2019/05/13 15:38:36 packer:     /usr/local/go/src/net/rpc/server.go:481 +0x440 
2019/05/13 15:38:36 [INFO] (telemetry) ending amazon-ebs 
2019/05/13 15:38:36 ui error: Build 'amazon-ebs' errored: unexpected EOF 
2019/05/13 15:38:36 Builds completed. Waiting on interrupt barrier... 
2019/05/13 15:38:36 machine readable: error-count []string{"1"} 
2019/05/13 15:38:36 /usr/local/bin/packer: plugin process exited 
2019/05/13 15:38:36 ui error:  
==> Some builds didn't complete successfully and had errors: 
panic: assignment to entry in nil map 
2019/05/13 15:38:36 packer:  
2019/05/13 15:38:36 packer: goroutine 124 [running]: 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/builder/amazon/common.(*StepAMIRegionCopy).Run(0xc0003840f0, 0x352f160, 0xc000328400, 0x350f5a0, 0xc00049d800, 0x0) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/builder/amazon/common/step_ami_region_copy.go:35 +0x2ad 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/helper/multistep.(*BasicRunner).Run(0xc00049d920, 0x352f160, 0xc000328400, 0x350f5a0, 0xc00049d800) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/helper/multistep/basic_runner.go:67 +0x1ec 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/builder/amazon/ebs.(*Builder).Run(0xc0000a0e00, 0x352f160, 0xc000328400, 0x353f860, 0xc0001ba380, 0x34d38e0, 0xc000038230, 0x40b919, 0xc00049d230, 0x30, ...) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/builder/amazon/ebs/builder.go:249 +0x12d0 
2019/05/13 15:38:36 packer: github.com/hashicorp/packer/packer/rpc.(*BuilderServer).Run(0xc0004557d0, 0x1, 0xc000566020, 0x0, 0x0) 
2019/05/13 15:38:36 packer:     /Users/mmarsh/go/src/github.com/hashicorp/packer/packer/rpc/builder.go:109 +0x231 
2019/05/13 15:38:36 packer: reflect.Value.call(0xc000096900, 0xc00000e0d8, 0x13, 0x2fdca52, 0x4, 0xc0000b0f18, 0x3, 0x3, 0xc0002fd040, 0x3, ...) 
2019/05/13 15:38:36 packer:     /usr/local/go/src/reflect/value.go:447 +0x461 
2019/05/13 15:38:36 packer: reflect.Value.Call(0xc000096900, 0xc00000e0d8, 0x13, 0xc000631718, 0x3, 0x3, 0xc000343a40, 0xc000631730, 0x404e35) 
2019/05/13 15:38:36 packer:     /usr/local/go/src/reflect/value.go:308 +0xa4 
2019/05/13 15:38:36 packer: net/rpc.(*service).call(0xc000092440, 0xc0000a81e0, 0xc000332260, 0xc000332270, 0xc000334500, 0xc0001ba0e0, 0x2744ac0, 0xc00056601c, 0x18a, 0x26b55a0, ...) 
2019/05/13 15:38:36 packer:     /usr/local/go/src/net/rpc/server.go:384 +0x14e 
2019/05/13 15:38:36 packer: created by net/rpc.(*Server).ServeCodec 
2019/05/13 15:38:36 packer:     /usr/local/go/src/net/rpc/server.go:481 +0x440 
2019/05/13 15:38:36 [INFO] (telemetry) ending amazon-ebs 
2019/05/13 15:38:36 ui error: Build 'amazon-ebs' errored: unexpected EOF 
2019/05/13 15:38:36 Builds completed. Waiting on interrupt barrier... 
2019/05/13 15:38:36 machine readable: error-count []string{"1"} 
2019/05/13 15:38:36 /usr/local/bin/packer: plugin process exited 
2019/05/13 15:38:36 ui error:  
==> Some builds didn't complete successfully and had errors: 
2019/05/13 15:38:36 machine readable: amazon-ebs,error []string{"unexpected EOF"} 
2019/05/13 15:38:36 ui error: --> amazon-ebs: unexpected EOF 
2019/05/13 15:38:36 ui:  
==> Builds finished but no artifacts were created. 
2019/05/13 15:38:36 [INFO] (telemetry) Finalizing. 
2019/05/13 15:38:36 waiting for all plugin processes to complete... 
2019/05/13 15:38:36 /usr/local/bin/packer: plugin process exited 
2019/05/13 15:38:36 /usr/local/bin/packer: plugin process exited 
 
2019/05/13 15:38:36 machine readable: amazon-ebs,error []string{"unexpected EOF"} 
2019/05/13 15:38:36 ui error: --> amazon-ebs: unexpected EOF 
==> Builds finished but no artifacts were created. 
2019/05/13 15:38:36 [INFO] (telemetry) Finalizing. 
2019/05/13 15:38:36 waiting for all plugin processes to complete... 
2019/05/13 15:38:36 /usr/local/bin/packer: plugin process exited 
2019/05/13 15:38:36 /usr/local/bin/packer: plugin process exited 
 
 
!!!!!!!!!!!!!!!!!!!!!!!!!!! PACKER CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!! 
 
Packer crashed! This is always indicative of a bug within Packer. 
A crash log has been placed at "crash.log" relative to your current 
working directory. It would be immensely helpful if you could please 
report the crash with Packer[1] so that we can fix this. 
 
[1]: https://github.com/hashicorp/packer/issues 
 
!!!!!!!!!!!!!!!!!!!!!!!!!!! PACKER CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!! 

packer.json

{
  "builders": [
    {
      "type": "amazon-ebs",
      "region": "us-east-1",
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "name": "amzn2-ami-ecs-hvm-2.*-x86_64-ebs",
          "root-device-type": "ebs"
        },
        "owners": [
          "amazon"
        ],
        "most_recent": true
      },
      "instance_type": "c5.large",
      "ssh_username": "ec2-user",
      "ami_name": "packer_test{{isotime \"2006_01_02\"}}_{{timestamp}}",
      "encrypt_boot": true,
      "kms_key_id": "arn:aws:kms:us-east-1:REDACTED:key/REDACTED",
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "inline": ["echo hello"]
    }
  ]
}