[Bug] Panic while Marshal embedded struct / Different result with std json

[ns-kliu]

Panic !!!

similar to #459

package main

import (
	stdjson "encoding/json"
	"fmt"
	gojson "github.com/goccy/go-json"
)

type Common struct {
	Domains []string `json:"domains,omitempty" binding:"required,gte=1,lte=3,unique,dive,required"`
}

type App struct {
	ID   uint   `json:"id,omitempty"`
	Type string `json:"type,omitempty"`
	Common
}

type Data struct {
	App
}

type AppGetResponse struct {
	TotalCount int    `json:"totalCount"`
	Data       []Data `json:"data,omitempty"`
}

func main() {
	totalCount := 1
	resp := AppGetResponse{TotalCount: totalCount}
	resp.Data = make([]Data, totalCount)
	resp.Data[0] = Data{
		App: App{
			ID:   1,
			Type: "custom",
			Common: Common{
				Domains: nil,
			},
		},
	}

	b1, _ := stdjson.Marshal(resp) // ok
	fmt.Println(string(b1))
	b2, _ := gojson.Marshal(resp) // panic!
	fmt.Println(string(b2))
}

{"totalCount":1,"data":[{"id":1,"type":"custom"}]}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x11052fc]

goroutine 1 [running]:
github.com/goccy/go-json/internal/encoder/vm.Run(0xc0000a2dd0, {0xc0000f2000?, 0x0?, 0x0?}, 0x0?)
        /Users/raymond_liu/go/pkg/mod/github.com/goccy/[email protected]/internal/encoder/vm/vm.go:26 +0x7c
github.com/goccy/go-json.encodeRunCode(0xc0000f1e28?, {0xc0000f2000?, 0x129bdc0?, 0xc0000b20c0?}, 0xc0000f2400?)
        /Users/raymond_liu/go/pkg/mod/github.com/goccy/[email protected]/encode.go:310 +0x68
github.com/goccy/go-json.encode(0xc0000a2dd0, {0x1146540, 0xc0000d60a0})
        /Users/raymond_liu/go/pkg/mod/github.com/goccy/[email protected]/encode.go:235 +0x21f
github.com/goccy/go-json.marshal({0x1146540, 0xc0000d60a0}, {0x0, 0x0, 0xc0000f1f50?})
        /Users/raymond_liu/go/pkg/mod/github.com/goccy/[email protected]/encode.go:150 +0xb9
github.com/goccy/go-json.MarshalWithOption(...)
        /Users/raymond_liu/go/pkg/mod/github.com/goccy/[email protected]/json.go:186
github.com/goccy/go-json.Marshal({0x1146540?, 0xc0000d60a0?})
        /Users/raymond_liu/go/pkg/mod/github.com/goccy/[email protected]/json.go:171 +0x2a
main.main()
        /Users/raymond_liu/GolandProjects/awesomeProject/main.go:44 +0x126

Process finished with the exit code 2

Got different result with stdjson

package main

import (
	stdjson "encoding/json"
	"fmt"
	gojson "github.com/goccy/go-json"
)

type Common struct {
	Domains []string `json:"domains,omitempty" binding:"required,gte=1,lte=3,unique,dive,required"`
}

type App struct {
	Common        // move embedded struct here
	ID     uint   `json:"id,omitempty"`
	Type   string `json:"type,omitempty"`
}

type Data struct {
	App
}

type AppGetResponse struct {
	TotalCount int    `json:"totalCount"`
	Data       []Data `json:"data,omitempty"`
}

func main() {
	totalCount := 1
	resp := AppGetResponse{TotalCount: totalCount}
	resp.Data = make([]Data, totalCount)
	resp.Data[0] = Data{
		App: App{
			ID:   1,
			Type: "custom",
			Common: Common{
				Domains: nil,
			},
		},
	}

	b1, _ := stdjson.Marshal(resp) // ok
	fmt.Println(string(b1))
	b2, _ := gojson.Marshal(resp) // different result!
	fmt.Println(string(b2))
}

{"totalCount":1,"data":[{"id":1,"type":"custom"}]}
{"totalCount":1,"data":[{}]}