diff --git a/scripts/existsSync.js b/scripts/existsSync.js
new file mode 100644
index 0000000..42adacd
--- /dev/null
+++ b/scripts/existsSync.js
@@ -0,0 +1,17 @@
+import path from 'path'
+import Promise from 'bluebird'
+import fs from 'fs'
+
+const access = Promise.promisify(fs.access)
+
+async function exists (fpath) {
+  try {
+    await access(path.resolve(fpath))
+  } catch (e) {
+    return false
+  }
+
+  return true
+}
+
+module.exports = exists
diff --git a/server/api/image.js b/server/api/image.js
index 20ca21e..6d6706c 100644
--- a/server/api/image.js
+++ b/server/api/image.js
@@ -61,7 +61,7 @@ async function imageBase64 (baseObj) {
   let fpath = path.join(images, imageName)
 
   try {
-    fs.writeFileSync(fpath, imgData.data)
+    await fs.writeFileAsync(fpath, imgData.data)
   } catch (e) {
     console.error(e)
     return null
diff --git a/server/api/index.js b/server/api/index.js
index f696ab5..9f8149e 100644
--- a/server/api/index.js
+++ b/server/api/index.js
@@ -2,6 +2,7 @@ import path from 'path'
 import cprog from 'child_process'
 import config from '../../scripts/load-config'
 import http from '../../scripts/http'
+import exists from '../../scripts/existsSync'
 import models from './models'
 import crypto from 'crypto'
 import notp from 'notp'
@@ -185,14 +186,14 @@ const API = {
       let uploadsDir = path.join(__dirname, '../../', 'usercontent', 'images')
       let pathOf = path.join(uploadsDir, fileName)
 
-      if (!fs.existsSync(pathOf)) {
+      if (!await exists(pathOf)) {
         return {error: 'No such file'}
       }
 
       // Delete previous upload
       if (user.avatar_file != null) {
         let file = path.join(uploadsDir, user.avatar_file)
-        if (fs.existsSync(file)) {
+        if (await exists(file)) {
           await fs.unlinkAsync(file)
         }
       }
@@ -206,7 +207,7 @@ const API = {
       if (!user.avatar_file) return {}
 
       let file = path.join(uploadsDir, user.avatar_file)
-      if (fs.existsSync(file)) {
+      if (await exists(file)) {
         await fs.unlinkAsync(file)
       }
 
diff --git a/server/routes/index.js b/server/routes/index.js
index 210be14..1f955ee 100644
--- a/server/routes/index.js
+++ b/server/routes/index.js
@@ -3,6 +3,7 @@ import path from 'path'
 import express from 'express'
 import RateLimit from 'express-rate-limit'
 import config from '../../scripts/load-config'
+import exists from '../../scripts/existsSync'
 import wrap from '../../scripts/asyncRoute'
 import http from '../../scripts/http'
 import API from '../api'
@@ -629,9 +630,9 @@ router.post('/user/manage/email', accountLimiter, wrap(async (req, res, next) =>
 
 // Serve a document form the documents directory, cache it.
 const docsDir = path.join(__dirname, '../../documents')
-router.get('/docs/:name', (req, res, next) => {
+router.get('/docs/:name', wrap(async (req, res, next) => {
   let doc = path.join(docsDir, req.params.name + '.html')
-  if (!fs.existsSync(docsDir) || !fs.existsSync(doc)) {
+  if (!await exists(docsDir) || !await exists(doc)) {
     return next()
   }
 
@@ -643,7 +644,7 @@ router.get('/docs/:name', (req, res, next) => {
 
   res.header('Cache-Control', 'max-age=' + 7 * 24 * 60 * 60 * 1000) // 1 week
   res.render('document', {doc: doc})
-})
+}))
 
 /*
   ========