diff --git a/src/commands/dev/index.js b/src/commands/dev/index.js
index 02d79f1..a0ea3e4 100644
--- a/src/commands/dev/index.js
+++ b/src/commands/dev/index.js
@@ -1,13 +1,13 @@
-const {flags} = require('@oclif/command')
-const {spawn} = require('child_process')
+const { flags } = require('@oclif/command')
+const { spawn } = require('child_process')
 const http = require('http')
 const httpProxy = require('http-proxy')
 const waitPort = require('wait-port')
 const getPort = require('get-port')
-const {serveFunctions} = require('@netlify/zip-it-and-ship-it')
-const {serverSettings} = require('../../detect-server')
+const { serveFunctions } = require('@netlify/zip-it-and-ship-it')
+const { serverSettings } = require('../../detect-server')
 const Command = require('@netlify/cli-utils')
-const {getAddons} = require('netlify/src/addons')
+const { getAddons } = require('netlify/src/addons')
 
 function cleanExit() {
   process.exit()
@@ -26,47 +26,45 @@ function addonUrl(addonUrls, req) {
 async function startProxy(settings, addonUrls) {
   const rulesProxy = require('netlify-rules-proxy')
 
-  await waitPort({port: settings.proxyPort})
+  await waitPort({ port: settings.proxyPort })
   if (settings.functionsPort) {
-    await waitPort({port: settings.functionsPort})
+    await waitPort({ port: settings.functionsPort })
   }
-  const port = await getPort({port: settings.port})
-  const functionsServer = settings.functionsPort ?
-    `http://localhost:${settings.functionsPort}` :
-    null
+  const port = await getPort({ port: settings.port })
+  const functionsServer = settings.functionsPort ? `http://localhost:${settings.functionsPort}` : null
 
   const proxy = httpProxy.createProxyServer({
     target: {
       host: 'localhost',
-      port: settings.proxyPort,
-    },
+      port: settings.proxyPort
+    }
   })
 
-  const rewriter = rulesProxy({publicFolder: settings.dist})
+  const rewriter = rulesProxy({ publicFolder: settings.dist })
 
-  const server = http.createServer(function (req, res) {
+  const server = http.createServer(function(req, res) {
     if (isFunction(settings, req)) {
-      return proxy.web(req, res, {target: functionsServer})
+      return proxy.web(req, res, { target: functionsServer })
     }
     let url = addonUrl(addonUrls, req)
     if (url) {
-      return proxy.web(req, res, {target: url})
+      return proxy.web(req, res, { target: url })
     }
 
     rewriter(req, res, () => {
       if (isFunction(settings, req)) {
-        return proxy.web(req, res, {target: functionsServer})
+        return proxy.web(req, res, { target: functionsServer })
       }
       url = addonUrl(addonUrls, req)
       if (url) {
-        return proxy.web(req, res, {target: url})
+        return proxy.web(req, res, { target: url })
       }
 
-      proxy.web(req, res, {target: `http://localhost:${settings.proxyPort}`})
+      proxy.web(req, res, { target: `http://localhost:${settings.proxyPort}` })
     })
   })
 
-  server.on('upgrade', function (req, socket, head) {
+  server.on('upgrade', function(req, socket, head) {
     proxy.ws(req, socket, head)
   })
 
@@ -82,17 +80,17 @@ function startDevServer(settings, log, error) {
       name: 'netlify-dev',
       port: settings.proxyPort,
       templates: {
-        notFound: '404.html',
-      },
+        notFound: '404.html'
+      }
     })
 
-    server.start(function () {
+    server.start(function() {
       log('Server listening to', settings.proxyPort)
     })
     return
   }
 
-  const ps = spawn(settings.cmd, settings.args, {env: settings.env})
+  const ps = spawn(settings.cmd, settings.args, { env: settings.env })
 
   ps.stdout.on('data', data => {
     log(`${data}`.replace(settings.urlRegexp, `$1$2${settings.port}$3`))
@@ -112,24 +110,23 @@ function startDevServer(settings, log, error) {
 
 class DevCommand extends Command {
   async run() {
-    const {flags, args} = this.parse(DevCommand)
-    const {api, site, config} = this.netlify
-    const functionsDir =
-      flags.functions || (config.build && config.build.functions)
+    const { flags, args } = this.parse(DevCommand)
+    const { api, site, config } = this.netlify
+    const functionsDir = flags.functions || (config.build && config.build.functions)
     const addonUrls = {}
     if (site.id && !flags.offline) {
       const accessToken = await this.authenticate()
       const addons = await getAddons(site.id, accessToken)
-      addons.forEach(addon => {
-        addonUrls[addon.slug] = `${addon.config.site_url}/.netlify/${
-          addon.slug
-        }`
-        for (const key in addon.env) {
-          process.env[key] = process.env[key] || addon.env[key]
-        }
-      })
+      if (Array.isArray(addons)) {
+        addons.forEach(addon => {
+          addonUrls[addon.slug] = `${addon.config.site_url}/.netlify/${addon.slug}`
+          for (const key in addon.env) {
+            process.env[key] = process.env[key] || addon.env[key]
+          }
+        })
+      }
       const api = this.netlify.api
-      const apiSite = await api.getSite({site_id: site.id})
+      const apiSite = await api.getSite({ site_id: site.id })
       // TODO: We should move the environment outside of build settings and possibly have a
       // `/api/v1/sites/:site_id/environment` endpoint for it that we can also gate access to
       // In the future and that we could make context dependend
@@ -147,12 +144,12 @@ class DevCommand extends Command {
         noCmd: true,
         port: 8888,
         proxyPort: 3999,
-        dist: config.build && config.build.publish,
+        dist: config.build && config.build.publish
       }
     }
     startDevServer(settings, this.log, this.error)
     if (functionsDir) {
-      const fnSettings = await serveFunctions({functionsDir})
+      const fnSettings = await serveFunctions({ functionsDir })
       settings.functionsPort = fnSettings.port
     }
 
@@ -165,30 +162,26 @@ DevCommand.description = `Local dev server
 The dev command will run a local dev server with Netlify's proxy and redirect rules
 `
 
-DevCommand.examples = [
-  '$ netlify dev',
-  '$ netlify dev -c "yarn start"',
-  '$ netlify dev -c hugo',
-]
+DevCommand.examples = ['$ netlify dev', '$ netlify dev -c "yarn start"', '$ netlify dev -c hugo']
 
 DevCommand.strict = false
 
 DevCommand.flags = {
-  cmd: flags.string({char: 'c', description: 'command to run'}),
+  cmd: flags.string({ char: 'c', description: 'command to run' }),
   devport: flags.integer({
     char: 'd',
-    description: 'port of the dev server started by command',
+    description: 'port of the dev server started by command'
   }),
-  port: flags.integer({char: 'p', description: 'port of netlify dev'}),
-  dir: flags.integer({char: 'd', description: 'dir with static files'}),
+  port: flags.integer({ char: 'p', description: 'port of netlify dev' }),
+  dir: flags.integer({ char: 'd', description: 'dir with static files' }),
   functions: flags.string({
     char: 'f',
-    description: 'Specify a functions folder to serve',
+    description: 'Specify a functions folder to serve'
   }),
   offline: flags.boolean({
     char: 'o',
-    description: 'disables any features that require network access',
-  }),
+    description: 'disables any features that require network access'
+  })
 }
 
 module.exports = DevCommand