Panic error in rds_exporter log after adding instance from second AWS account

time="2018-11-21T11:26:55Z" level=info msg="Using 1 sessions." component=sessions source="sessions.go:149"
time="2018-11-21T11:26:55Z" level=info msg="Updating enhanced metrics every 10s." component=enhanced source="collector.go:49"
time="2018-11-21T11:26:55Z" level=info msg="Basic metrics   : http://127.0.0.1:9042/basic" source="main.go:65"
time="2018-11-21T11:26:55Z" level=info msg="Enhanced metrics: http://127.0.0.1:9042/enhanced" source="main.go:66"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x89f36a]

goroutine 27 [running]:
github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session.(*Session).Copy(0x0, 0x0, 0x0, 0x0, 0xc4203ea400)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session/session.go:550 +0x3a
github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session.(*Session).clientConfigWithErr(0x0, 0xb0c872, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session/session.go:571 +0x88
github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session.(*Session).ClientConfig(0x0, 0xb0c872, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session/session.go:565 +0xbd
github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/service/cloudwatch.New(0xbb5b20, 0x0, 0x0, 0x0, 0x0, 0x0)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/service/cloudwatch/service.go:48 +0x88
github.com/percona/rds_exporter/basic.NewScraper(0xc42006e600, 0xc4200b4340, 0xc4202ce360, 0x1)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/basic/scraper.go:34 +0x86
github.com/percona/rds_exporter/basic.(*Exporter).collect.func1(0xc42006e600, 0xc4200b4340, 0xc4202ce360, 0xc4204940d0)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/basic/basic.go:64 +0x3f
created by github.com/percona/rds_exporter/basic.(*Exporter).collect
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/basic/basic.go:63 +0xec
time="2018-11-21T11:27:00Z" level=info msg="Starting RDS exporter (version=, branch=, revision=)" source="main.go:30"
time="2018-11-21T11:27:00Z" level=info msg="Build context (go=go1.10.1, user=, date=)" source="main.go:31"
time="2018-11-21T11:27:00Z" level=info msg="Creating sessions..." component=sessions source="sessions.go:35"
time="2018-11-21T11:27:00Z" level=error msg="Skipping instance us-east-1/rds-aurora1 - can't determine resourceID." component=sessions source="sessions.go:125"
time="2018-11-21T11:27:00Z" level=error msg="Skipping instance us-east-1/rds-mysql56 - can't determine resourceID." component=sessions source="sessions.go:125"
Region     Instance     Resource ID                    Interval
us-east-1  aurora57pmm  db-GR4HWW3VHLL3KZBTJ7EDUU2A4A  1m0s
time="2018-11-21T11:27:00Z" level=info msg="Using 1 sessions." component=sessions source="sessions.go:149"
time="2018-11-21T11:27:00Z" level=info msg="Updating enhanced metrics every 10s." component=enhanced source="collector.go:49"
time="2018-11-21T11:27:00Z" level=info msg="Basic metrics   : http://127.0.0.1:9042/basic" source="main.go:65"
time="2018-11-21T11:27:00Z" level=info msg="Enhanced metrics: http://127.0.0.1:9042/enhanced" source="main.go:66"
[[email protected] opt]# tail -50 /var/log/pmm-rds_exporter-9042.log 
github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session.(*Session).ClientConfig(0x0, 0xb0c872, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/aws/session/session.go:565 +0xbd
github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/service/cloudwatch.New(0xbb5b20, 0x0, 0x0, 0x0, 0x0, 0x0)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/aws/aws-sdk-go/service/cloudwatch/service.go:48 +0x88
github.com/percona/rds_exporter/basic.NewScraper(0xc42019c180, 0xc420159900, 0xc420166000, 0xf551a0)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/basic/scraper.go:34 +0x86
github.com/percona/rds_exporter/basic.(*Exporter).collect.func1(0xc42019c180, 0xc420159900, 0xc420166000, 0xc4204342d0)
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/basic/basic.go:64 +0x3f
created by github.com/percona/rds_exporter/basic.(*Exporter).collect
	/home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/basic/basic.go:63 +0xec
time="2018-11-21T12:55:12Z" level=info msg="Starting RDS exporter (version=, branch=, revision=)" source="main.go:30"
time="2018-11-21T12:55:12Z" level=info msg="Build context (go=go1.10.1, user=, date=)" source="main.go:31"
time="2018-11-21T12:55:12Z" level=info msg="Creating sessions..." component=sessions source="sessions.go:35"
time="2018-11-21T12:55:12Z" level=error msg="Skipping instance us-east-1/rds-aurora1 - can't determine resourceID." component=sessions source="sessions.go:125"
time="2018-11-21T12:55:12Z" level=error msg="Skipping instance us-east-1/rds-mysql56 - can't determine resourceID." component=sessions source="sessions.go:125"