Crash when querying two separate environements

[sysadmin1139]

This afternoon we found a multiple environment Terraform crash. It doesn't seem to be consistent with where it bombs, or which specific resources trigger it. However, it does happen every time, and does it in two separate projects, with two separate terraform-provider-aws versions (1.12 and 1.7.1). All is with terraform 11.2

GPGed crash-dumps

All it takes is a plan, because the crash happens during the check versus the statefiles. This feels like a change on the Amazon side, since this suddenly started happening today, and neither environment has seen significant changes other than strings to datafiles. No resource-definition changes.

panic: runtime error: invalid memory address or nil pointer dereference
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1d4e5da]
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: goroutine 1209 [running]:
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: github.com/terraform-providers/terraform-provider-aws/aws.flattenAwsLbTargetGroupResource(0xc4206f0150, 0x264d900, 0xc4201b6500, 0xc421186480, 0x0, 0x0)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/opt/teamcity-agent/work/222ea50a1b4f75f4/src/github.com/terraform-providers/terraform-provider-aws/aws/resource_aws_lb_target_group.go:468 +0x5fa
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: github.com/terraform-providers/terraform-provider-aws/aws.resourceAwsLbTargetGroupRead(0xc4206f0150, 0x264d900, 0xc4201b6500, 0xc4206f0150, 0x0)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/opt/teamcity-agent/work/222ea50a1b4f75f4/src/github.com/terraform-providers/terraform-provider-aws/aws/resource_aws_lb_target_group.go:276 +0x28b
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: github.com/terraform-providers/terraform-provider-aws/vendor/github.com/hashicorp/terraform/helper/schema.(*Resource).Refresh(0xc4208fd3b0, 0xc4211401e0, 0x264d900, 0xc4201b6500, 0xc420286f00, 0xc4202fe001, 0x80000000018)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/opt/teamcity-agent/work/222ea50a1b4f75f4/src/github.com/terraform-providers/terraform-provider-aws/vendor/github.com/hashicorp/terraform/helper/schema/resource.go:354 +0x17e
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: github.com/terraform-providers/terraform-provider-aws/vendor/github.com/hashicorp/terraform/helper/schema.(*Provider).Refresh(0xc4208fd500, 0xc421140190, 0xc4211401e0, 0x7f2717763000, 0x0, 0x0)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/opt/teamcity-agent/work/222ea50a1b4f75f4/src/github.com/terraform-providers/terraform-provider-aws/vendor/github.com/hashicorp/terraform/helper/schema/provider.go:308 +0x9a
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: github.com/terraform-providers/terraform-provider-aws/vendor/github.com/hashicorp/terraform/plugin.(*ResourceProviderServer).Refresh(0xc420823440, 0xc42052c940, 0xc42052caf0, 0x0, 0x0)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/opt/teamcity-agent/work/222ea50a1b4f75f4/src/github.com/terraform-providers/terraform-provider-aws/vendor/github.com/hashicorp/terraform/plugin/resource_provider.go:549 +0x4e
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: reflect.Value.call(0xc4201cc780, 0xc42000c5b8, 0x13, 0x2a69310, 0x4, 0xc420be2f20, 0x3, 0x3, 0x403a23, 0xc4204c0000, ...)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/usr/local/go/src/reflect/value.go:434 +0x905
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: reflect.Value.Call(0xc4201cc780, 0xc42000c5b8, 0x13, 0xc42072f720, 0x3, 0x3, 0xc42072f720, 0xc42072f728, 0xc4209a9b00)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/usr/local/go/src/reflect/value.go:302 +0xa4
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: net/rpc.(*service).call(0xc420391ec0, 0xc4208048c0, 0xc420530970, 0xc420548480, 0xc4202d8780, 0x2198ce0, 0xc42052c940, 0x16, 0x2198d20, 0xc42052caf0, ...)
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/usr/local/go/src/net/rpc/server.go:381 +0x142
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: created by net/rpc.(*Server).ServeCodec
2018-03-28T17:48:33.304-0500 [DEBUG] plugin.terraform-provider-aws_v1.12.0_x4: 	/usr/local/go/src/net/rpc/server.go:475 +0x36b

[sysadmin1139]

Looks like this is a duplicate of #3954

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!