Sql invalid memory address or nil pointer deference error

gistfile1.txt

ab -c 35 -n 1000 http://127.0.0.1:8000/

gistfile2.txt

http: panic serving 127.0.0.1:51751: runtime error: invalid memory address or nil pointer dereference
/usr/local/Cellar/go/1.0.3/src/pkg/net/http/server.go:589 (0x342dc)
  _func_004: buf.Write(debug.Stack())
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/proc.c:1443 (0x11689)
	panic: reflect·call(d->fn, d->args, d->siz);
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/runtime.c:128 (0x12155)
	panicstring: runtime·panic(err);
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/thread_darwin.c:418 (0x152a4)
	sigpanic: runtime·panicstring("invalid memory address or nil pointer dereference");
/usr/local/Cellar/go/1.0.3/src/pkg/database/sql/sql.go:1004 (0x62f12)
	(*Rows).Close: if rs.closed {
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/proc.c:1443 (0x11689)
	panic: reflect·call(d->fn, d->args, d->siz);
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/runtime.c:128 (0x12155)
	panicstring: runtime·panic(err);
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/thread_darwin.c:418 (0x152a4)
	sigpanic: runtime·panicstring("invalid memory address or nil pointer dereference");
/usr/local/Cellar/go/1.0.3/src/pkg/database/sql/sql.go:911 (0x62449)
	(*Rows).Next: if rs.closed {
/Users/garrensmith/WebDev/go/sql_server.go:42 (0x234b)
	GetAll: for rows.Next() {
/Users/garrensmith/WebDev/go/sql_server.go:66 (0x28b3)
	boom: orgs, _ := GetAll()
/usr/local/Cellar/go/1.0.3/src/pkg/net/http/server.go:703 (0x28125)
	HandlerFunc.ServeHTTP: f(w, r)
/usr/local/Cellar/go/1.0.3/src/pkg/net/http/server.go:941 (0x28f79)
	(*ServeMux).ServeHTTP: mux.handler(r).ServeHTTP(w, r)
/usr/local/Cellar/go/1.0.3/src/pkg/net/http/server.go:669 (0x27f38)
	(*conn).serve: handler.ServeHTTP(w, w.req)
/usr/local/Cellar/go/1.0.3/src/pkg/runtime/proc.c:271 (0xf78f)
	goexit: runtime·goexit(void)

server.go

package main

import (
  "os"
  "net/http"
  "log"
  "fmt"
  "time"
  "encoding/json"
   "database/sql"
  _ "github.com/bmizerany/pq"
)

type Organisation struct {
  Id          int `json:"id"`
  Name        string `json:"name"`
  Subdomain   string `json:"subdomain"`
  UserCount   int `json:"users"`
}

var (
  db *sql.DB
)

func newConn(conn string) {
  var err error
  log.Println("connection")
  log.Println(conn)
  db, err = sql.Open("postgres", conn)

  if err != nil {
    fmt.Printf("Another ERROR %+v", err)
  }
}

func GetAll() ([]Organisation, error) {
  organisations := make([]Organisation, 0)

  rows, err := db.Query("SELECT id, name, subdomain FROM organisations")
  defer rows.Close()

  for rows.Next() {
    org := Organisation{}
    rows.Scan(&org.Id, &org.Name, &org.Subdomain)
    org.UserCount = getUserCount(db, org.Id)

    organisations = append(organisations, org)
  }

  return organisations, err
}

func getUserCount(db *sql.DB, id int) (count int) {
  row := db.QueryRow("SELECT COUNT(*) FROM organisation_users WHERE organisation_users.organisation_id = $1", id)
  row.Scan(&count)

  return
}



func boom(w http.ResponseWriter, req *http.Request) {
  w.Header().Add("content-type", "application/json")
  fmt.Println("boom request", time.Now())

  orgs, _ := GetAll()

  orgs_json, _ := json.Marshal(orgs)
  w.Write(orgs_json)
}

func main() {
  fmt.Println("Go Server running on 8000 \n")
  newConn(os.Getenv("DATABASE_URL"))

  http.HandleFunc("/", boom)

  err := http.ListenAndServe(":8000", nil )
  if err != nil {
    log.Printf("error running docs webserver: %v", err)
  }
}