SIGSEGV when using . as package path

[petergtz]

$ ~/workplace/go/src/github.com/petergtz/alexa-journal
± |master {1} U:7 ?:3 ✗| → pegomock generate --use-experimental-model-gen . JournalProvider
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x12f4b95]

goroutine 1 [running]:
github.com/petergtz/pegomock/modelgen/loader.GenerateModel(0x7ffeefbff60f, 0x1, 0x7ffeefbff611, 0xf, 0x0, 0x100eddb, 0x100eddb)
	/Volumes/workplace/go/pkg/mod/github.com/petergtz/[email protected]+incompatible/modelgen/loader/loader.go:22 +0xd5
github.com/petergtz/pegomock/pegomock/filehandling.GenerateMockSourceCode(0xc00009a240, 0x2, 0x2, 0x0, 0x0, 0xc0000de018, 0x12, 0x0, 0x0, 0x0, ...)
	/Volumes/workplace/go/pkg/mod/github.com/petergtz/[email protected]+incompatible/pegomock/filehandling/filehandling.go:102 +0x21a
github.com/petergtz/pegomock/pegomock/filehandling.GenerateMockFile(0xc00009a240, 0x2, 0x2, 0xc0000da060, 0x5b, 0x0, 0x0, 0xc0000de018, 0x12, 0x0, ...)
	/Volumes/workplace/go/pkg/mod/github.com/petergtz/[email protected]+incompatible/pegomock/filehandling/filehandling.go:64 +0xdd
github.com/petergtz/pegomock/pegomock/filehandling.GenerateMockFileInOutputDir(0xc00009a240, 0x2, 0x2, 0xc00002c0a4, 0x3e, 0x0, 0x0, 0x0, 0x0, 0xc0000de018, ...)
	/Volumes/workplace/go/pkg/mod/github.com/petergtz/[email protected]+incompatible/pegomock/filehandling/filehandling.go:40 +0x18d
main.Run(0xc0000200a0, 0x5, 0x5, 0x1401fd0, 0xc000010020, 0x1401fb0, 0xc000010010, 0xc0000d8000, 0xc0000da000)
	/Volumes/workplace/go/pkg/mod/github.com/petergtz/[email protected]+incompatible/pegomock/main.go:116 +0x218c
main.main()
	/Volumes/workplace/go/pkg/mod/github.com/petergtz/[email protected]+incompatible/pegomock/main.go:37 +0xa8