diff --git a/lib/note/index.js b/lib/note/index.js
index 0a20238e..7f215149 100644
--- a/lib/note/index.js
+++ b/lib/note/index.js
@@ -268,7 +268,7 @@ const deleteNote = async (req, res) => {
 }
 
 const updateNote = async (req, res) => {
-  if (req.isAuthenticated()) {
+  if (req.isAuthenticated() || config.allowAnonymousEdits) {
     const noteId = await Note.parseNoteIdAsync(req.params.noteId)
     try {
       const note = await Note.findOne({
@@ -294,7 +294,7 @@ const updateNote = async (req, res) => {
         lastchangeAt: now,
         authorship: [
           [
-            req.user.id,
+            req.isAuthenticated() ? req.user.id : null,
             0,
             content.length,
             now,
@@ -308,7 +308,9 @@ const updateNote = async (req, res) => {
         return errorInternalError(req, res)
       }
 
-      updateHistory(req.user.id, note.id, content)
+      if (req.isAuthenticated()) {
+        updateHistory(req.user.id, note.id, content)
+      }
 
       Revision.saveNoteRevision(note, (err, revision) => {
         if (err) {
@@ -321,7 +323,7 @@ const updateNote = async (req, res) => {
         })
       })
     } catch (err) {
-      logger.error(err)
+      logger.error(err.stack)
       logger.error('Update note failed: Internal Error.')
       return errorInternalError(req, res)
     }