panic: runtime error: index out of range [0] with length 0

[myuon]

coreで go run github.com/matsuri-tech/golint-extra ./... した結果

panic: runtime error: index out of range [0] with length 0

goroutine 3683 [running]:
github.com/matsuri-tech/golint-extra/rules.run.func2(0x80cec0, 0xc0006335c0)
        /home/ishibashi/go/pkg/mod/github.com/matsuri-tech/golint-extra@v0.0.0-20200313095921-7f08cdca73ed/rules/zerovalue_struct.go:140 +0xa1a                                                                                                                               
golang.org/x/tools/go/ast/inspector.(*Inspector).Preorder(0xc0032efc60, 0xc000a799e0, 0x1, 0x1, 0xc000a79a50)
        /home/ishibashi/go/pkg/mod/golang.org/x/tools@v0.0.0-20200308013534-11ec41452d41/go/ast/inspector/inspector.go:77 +0x9f
github.com/matsuri-tech/golint-extra/rules.run(0xc003310820, 0xc00328dc30, 0xa12a80, 0xc00319f708, 0x8)
        /home/ishibashi/go/pkg/mod/github.com/matsuri-tech/golint-extra@v0.0.0-20200313095921-7f08cdca73ed/rules/zerovalue_struct.go:103 +0x40c                                                                                                                               
golang.org/x/tools/go/analysis/internal/checker.(*action).execOnce(0xc0032ec460)
        /home/ishibashi/go/pkg/mod/golang.org/x/tools@v0.0.0-20200308013534-11ec41452d41/go/analysis/internal/checker/checker.go:658 +0x6fa                                                                                                                                   
sync.(*Once).doSlow(0xc0032ec460, 0xc0007a0f90)
        /snap/go/5364/src/sync/once.go:66 +0xe3
sync.(*Once).Do(...)
        /snap/go/5364/src/sync/once.go:57
golang.org/x/tools/go/analysis/internal/checker.(*action).exec(0xc0032ec460)
        /home/ishibashi/go/pkg/mod/golang.org/x/tools@v0.0.0-20200308013534-11ec41452d41/go/analysis/internal/checker/checker.go:577 +0x60                                                                                                                                    
golang.org/x/tools/go/analysis/internal/checker.execAll.func1(0xc0032ec460)
        /home/ishibashi/go/pkg/mod/golang.org/x/tools@v0.0.0-20200308013534-11ec41452d41/go/analysis/internal/checker/checker.go:565 +0x34                                                                                                                                    
created by golang.org/x/tools/go/analysis/internal/checker.execAll
        /home/ishibashi/go/pkg/mod/golang.org/x/tools@v0.0.0-20200308013534-11ec41452d41/go/analysis/internal/checker/checker.go:571 +0x119                                                                                                                                   
exit status 2