Gin Panic: runtime error: invalid memory address or nil pointer dereference

Description

When I using Gin http get request to get the result synchronously, the following panic occurrs.

How to reproduce

The problem occurs occasionally, so I can't locate where the problem is.Below is the brief code.

package main

import (
    "github.com/gin-gonic/gin"
    "net/http"
)

type Gin struct {
    C *gin.Context
}

func (g *Gin) AgentResponse(httpCode int, status string, message string, data interface{}) {
    g.C.JSON(httpCode, Response{
        Status:  status,
        Message: message,
        Detail:  data,
    })
}

func main() {
    g := gin.Default()
    g.GET("/hello/world", func(c *gin.Context) {
        instanceId := c.DefaultQuery("InstanceId", "")
        ugin := Gin{C: c}
        ugin.AgentResponse(http.StatusOK, "Success", "", nil)
    })
    g.Run(":9000")
}

Expectations

$ curl http://localhost:9000/hello/world
{
  "Detail": null,
  "Message": "",
  "Status": "Success"
}

Actual result

$ curl -i http://localhost:8201/hello/world
http: panic serving 10.0.9.53:54118: runtime error: invalid memory address or nil pointer dereference
...
As shown above.

Environment

• go version: 1.13
• gin version (or commit ref): 1.6.3
• operating system: centos 7.6

Comment From: Gasoid

most likely your code is not working. there is no Response struct