panic: runtime error: invalid memory address or nil pointer dereference

Question

I'm currently working with a Soundcloud wrapper for Go, I want to print the user's followers but it is the first time I face pointer issues.

After building error

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x10 pc=0xc9c26]

Code

package main

import (
    "fmt"
    "github.com/njasm/gosoundcloud"
)


func main() {
    //  callback url is optional - nil in example
    s, _ := gosoundcloud.NewSoundcloudApi("Client_Id", "Client_Secret", nil)
    var userID uint64 = 1
    member, err := s.GetUser(userID)
    if err != nil {
               panic(err)
     }
    fmt.Println(member.Followers)
}

After building

goroutine 1 [running]:
panic(0x3508c0, 0xc82000a0b0)
    /usr/local/go/src/runtime/panic.go:481 +0x3e6
net/http.(*Client).doFollowingRedirects(0x0, 0xc8200d0000, 0x4611c8, 0x0, 0x0, 0x0)
    /usr/local/go/src/net/http/client.go:429 +0x66
net/http.(*Client).Do(0x0, 0xc8200d0000, 0x8, 0x0, 0x0)
    /usr/local/go/src/net/http/client.go:188 +0xff
github.com/njasm/gosoundcloud.(*SoundcloudApi).do(0xc8200c8720, 0xc8200d0000, 0xc820012f00, 0x0, 0x0)
    /Users/ManuelDao/Documents/GoBot/src/github.com/njasm/gosoundcloud/soundcloud.go:217 +0x4b
github.com/njasm/gosoundcloud.(*SoundcloudApi).Get(0xc8200c8720, 0xc820012f00, 0x22, 0x0, 0x1, 0x0, 0x0)
    /Users/ManuelDao/Documents/GoBot/src/github.com/njasm/gosoundcloud/soundcloud.go:92 +0xe1
github.com/njasm/gosoundcloud.(*SoundcloudApi).GetUser(0xc8200c8720, 0x1, 0x417a80, 0x0, 0x0)
        /Users/ManuelDao/Documents/GoBot/src/github.com/njasm/gosoundcloud/soundcloud.go:276 +0xc6
main.main()
        /Users/ManuelDao/Documents/GoBot/src/GoBot/GoBot.go:24 +0x70
exit status 2

John Smith · Accepted Answer · 2016-05-15 01:26:45Z

1

I've never used this lib before, but it looks like you forgot to authenticate yourself.

s, _ := gosoundcloud.NewSoundcloudApi("Client_Id", "Client_Secret", nil)
if err = s.PasswordCredentialsToken("[email protected]", "your_password"); err != nil {
    // handle err
}

Something like this maybe?

answered May 15, 2016 at 1:26

John Smith

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5 Comments

Juanvulcano Over a year ago

Not really, to get the data it shouldn't be necessary to login with the api. Here's a link to the library godoc.org/github.com/njasm/gosoundcloud

John Smith Over a year ago

Well, I just tried out your exact example and it fails with the same nil pointer error. After getting the token with PasswordCredentialsToken everything worked fine. I've checked the example at github.com/njasm/gosoundcloud

Juanvulcano Over a year ago

I plugged in your code and it tells me err not defined, I'm relatively new at Go. How did you handled the error?

John Smith Over a year ago

Well... if there is no error then there is no error! :) In theory your code shouldn't panic now, have you tried it? Edit: if you plugged in the same exact code, then err is only defined within the if's scope.

Juanvulcano Over a year ago

Yes John! I tried it before commenting, I got at line 12 undefined: err

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