panic: runtime error: invalid memory address or nil pointer dereference

[sdiver78]

General information:

• Operating System: Ubuntu 20.04
• Terracognita version / tag: Starting Terracognita with version v0.7.6
• Did you build Terracognita from sources or did you use the Docker image: Binary install

Describe the bug:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x66ffdae]

Log message

ts=2022-05-23T22:44:25.334207993Z caller=import.go:175 func=provider.Import resource=aws_alb_target_group msg="importing done"
ts=2022-05-23T22:44:25.334232098Z caller=import.go:82 func=provider.Import resource=aws_alb_target_group_attachment msg="fetching the list of resources"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x66ffdae]

goroutine 1 [running]:
github.com/cycloidio/terracognita/aws.albTargetGroupAttachments({0x11ba4038, 0xc0000720b8}, 0xc000dd5180, {0x106959c7, 0xc000ba5210}, 0xc0016a5600)
	/tmp/build/6b18b934/code/aws/resources.go:498 +0x38e
github.com/cycloidio/terracognita/aws.(*aws).Resources(0xc002f12d50, {0x11ba4038, 0xc0000720b8}, {0x106959c7, 0x1f}, 0x3)
	/tmp/build/6b18b934/code/aws/provider.go:96 +0xba
github.com/cycloidio/terracognita/provider.Import({0x11ba4038, 0xc0000720b8}, {0x11dca848, 0xc000dd5180}, {0x11ba5768, 0xc001e46dc0}, {0x0, 0x0}, 0xc001e97260, {0x11a9b4c0, ...})
	/tmp/build/6b18b934/code/provider/import.go:91 +0xae3
github.com/cycloidio/terracognita/cmd.glob..func2(0x1c32f300, {0xc000bd0200, 0x8, 0x8})
	/tmp/build/6b18b934/code/cmd/aws.go:110 +0x846
github.com/spf13/cobra.(*Command).execute(0x1c32f300, {0xc000bd0180, 0x8, 0x8})
	/tmp/build/6b18b934/go/pkg/mod/github.com/spf13/[email protected]/command.go:852 +0x60e
github.com/spf13/cobra.(*Command).ExecuteC(0x1c32f080)
	/tmp/build/6b18b934/go/pkg/mod/github.com/spf13/[email protected]/command.go:960 +0x3ad
github.com/spf13/cobra.(*Command).Execute(...)
	/tmp/build/6b18b934/go/pkg/mod/github.com/spf13/[email protected]/command.go:897
main.main()
	/tmp/build/6b18b934/code/main.go:11 +0x25

and

ts=2022-05-23T22:29:48.115431118Z caller=import.go:82 func=provider.Import resource=aws_lb_target_group_attachment msg="fetching the list of resources"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x66ffdae]

goroutine 1 [running]:
github.com/cycloidio/terracognita/aws.albTargetGroupAttachments({0x11ba4038, 0xc0000720b8}, 0xc000d96680, {0x10696052, 0xc00043f290}, 0xc0031e1c00)
	/tmp/build/6b18b934/code/aws/resources.go:498 +0x38e
github.com/cycloidio/terracognita/aws.(*aws).Resources(0xc002bf00f0, {0x11ba4038, 0xc0000720b8}, {0x10696052, 0x1e}, 0x3)
	/tmp/build/6b18b934/code/aws/provider.go:96 +0xba
github.com/cycloidio/terracognita/provider.Import({0x11ba4038, 0xc0000720b8}, {0x11dca848, 0xc000d96680}, {0x11ba5768, 0xc001e2af00}, {0x0, 0x0}, 0xc001e7fa40, {0x11a9b4c0, ...})
	/tmp/build/6b18b934/code/provider/import.go:91 +0xae3
github.com/cycloidio/terracognita/cmd.glob..func2(0x1c32f300, {0xc000b466e0, 0xa, 0xa})
	/tmp/build/6b18b934/code/cmd/aws.go:110 +0x846
github.com/spf13/cobra.(*Command).execute(0x1c32f300, {0xc000b465a0, 0xa, 0xa})
	/tmp/build/6b18b934/go/pkg/mod/github.com/spf13/[email protected]/command.go:852 +0x60e
github.com/spf13/cobra.(*Command).ExecuteC(0x1c32f080)
	/tmp/build/6b18b934/go/pkg/mod/github.com/spf13/[email protected]/command.go:960 +0x3ad
github.com/spf13/cobra.(*Command).Execute(...)
	/tmp/build/6b18b934/go/pkg/mod/github.com/spf13/[email protected]/command.go:897
main.main()
	/tmp/build/6b18b934/code/main.go:11 +0x25

Seems related to #213

[xescugc]

Ok this looks quite related to #213 so I'll add a more "thoughtful" validation haha.