无效的内存地址或与mgo的零指针取消引用

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
    "github.com/gorilla/handlers"
    "github.com/gorilla/mux"
    "gopkg.in/mgo.v2"
)

type DataIg struct {
    Member string `json:"Member"`
    Timestamp float64 `json:"Timestamp"`
    Name string `json:"Name"`
    Bid string `json:"Bid"`
    Offer string`json:"Offer"`
    Change string `json:"Change"`
    Hour  string `json:"Hour"`
}

type Response struct {
    Status string
}

var session *mgo.Session
var c *mgo.Collection

func postData(w http.ResponseWriter, r *http.Request) {
    var response  = Response{}
    response.Status = "ok"
    var reception = DataIg{}

    err := c.Insert(reception)

    body, err := ioutil.ReadAll(r.Body)
    if err != nil {
        panic(err)
    }
    err = json.Unmarshal(body, &reception)
    fmt.Println(reception)
    js, err := json.Marshal(response)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    w.Header().Set("Content-Type", "application/json")
    w.Write(js)
}

var appName = "accountservice"

func main() {
    session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
    session.SetMode(mgo.Monotonic, true)
    c = session.DB("database").C("igData")
    fmt.Printf("Starting %v\n", appName)
    router := mux.NewRouter()
    router.HandleFunc("/postData", postData).Methods("POST")
    corsObj := handlers.AllowedOrigins([]string{"*"})
    http.ListenAndServe(":8066", handlers.CORS(corsObj)(router))
    defer session.Close()
}

我正在努力使 session c )在其他函数中使用它们,而不是 PostData .

但我有一个:

解引用[信号SIGSEGV:分段冲突代码=0x1地址=0x0 pc=0x683587]

会话:=mgo拨号("mongodb://toto:titib@56.39.92.666:27017/")

当做