panic: runtime error: cgo argument has Go pointer to Go pointer

goroutine 1 [running]:
panic(0x85c620, 0x48202a2d10)
	/usr/lib/go-1.6/src/runtime/panic.go:481 +0x384
launchpad.net/ubuntu-push/launch_helper/cual.(*helperState).InstallObserver(0x48200c7980, 0x482029d040, 0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/launch_helper/cual/cual.go:67 +0x70
launchpad.net/ubuntu-push/launch_helper.(*kindHelperPool).Start(0x482005d560, 0x482029d020)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/launch_helper/kindpool.go:103 +0x228
launchpad.net/ubuntu-push/client/service.(*PostalService).init(0x48200fe180, 0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/service/postal.go:188 +0xc9c
launchpad.net/ubuntu-push/client/service.(*PostalService).(launchpad.net/ubuntu-push/client/service.init)-fm(0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/service/postal.go:153 +0x28
launchpad.net/ubuntu-push/client/service.(*DBusService).Start(0x48200fe180, 0x482021e330, 0x940d60, 0x11, 0x93a780, 0x12, 0x940d60, 0x11, 0x482020dbe0, 0x0, ...)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/service/common.go:93 +0x1e8
launchpad.net/ubuntu-push/client/service.(*PostalService).Start(0x48200fe180, 0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/service/postal.go:153 +0x36c
launchpad.net/ubuntu-push/client.(*PushClient).startPostalService(0x482007cd80, 0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/client.go:530 +0x44
launchpad.net/ubuntu-push/client.(*PushClient).(launchpad.net/ubuntu-push/client.startPostalService)-fm(0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/client.go:544 +0x28
launchpad.net/ubuntu-push/client.(*PushClient).doStart(0x482007cd80, 0x482020ddd8, 0x9, 0x9, 0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/client.go:489 +0x5c
launchpad.net/ubuntu-push/client.(*PushClient).Start(0x482007cd80, 0x0, 0x0)
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/client/client.go:548 +0x2f0
main.main()
	/build/ubuntu-push-XOrl4C/ubuntu-push-0.68+16.04.20161003/obj-aarch64-linux-gnu/src/launchpad.net/ubuntu-push/ubuntu-push-client.go:56 +0x318