diff --git a/CHANGELOG.md b/CHANGELOG.md
index cdbf1338acc..6a5946ab844 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Bugfixes:
   - newRxError is not a constructor [#719](https://github.com/pubkey/rxdb/issues/719) thanks [@errorx666](https://github.com/errorx666)
   - Collection name validation is too strict [#720](https://github.com/pubkey/rxdb/issues/720) thanks [@errorx666](https://github.com/errorx666)
   - Field names can't be one character long [#717](https://github.com/pubkey/rxdb/issues/717) thanks [@errorx666](https://github.com/errorx666)
+  - Invalid value persists in document after failed update [#734](https://github.com/pubkey/rxdb/issues/734) thanks [@rybaczewa](https://github.com/rybaczewa)
 
 ### 7.7.0 (July 6, 2018)
 
diff --git a/src/plugins/update.js b/src/plugins/update.js
index c3630f54920..ea84228d3ae 100644
--- a/src/plugins/update.js
+++ b/src/plugins/update.js
@@ -5,10 +5,13 @@
  */
 import modifyjs from 'modifyjs';
 import deepEqual from 'deep-equal';
+import {
+    clone
+} from '../util.js';
 
 export function update(updateObj) {
+    const oldDocData = clone(this._data);
     const newDoc = modifyjs(this._data, updateObj);
-
     Object.keys(this._data).forEach((previousPropName) => {
         if (newDoc[previousPropName]) {
             // if we don't check inequality, it triggers an update attempt on fields that didn't really change,
@@ -24,7 +27,13 @@ export function update(updateObj) {
         .filter(newPropName => !deepEqual(this._data[newPropName], newDoc[newPropName]))
         .forEach(newPropName => this._data[newPropName] = newDoc[newPropName]);
 
-    return this.save();
+    return this.save()
+        .then(() => this)
+        .catch(err => {
+            // save was not successfull, reset doc-data
+            this._data = oldDocData;
+            throw err;
+        });
 }
 
 export async function RxQueryUpdate(updateObj) {
diff --git a/test/unit.test.js b/test/unit.test.js
index 0064ce2df9a..1edbd98216a 100644
--- a/test/unit.test.js
+++ b/test/unit.test.js
@@ -7,6 +7,7 @@ const nodeAndBrowser = [
     '../test_tmp/unit/instance-of-check.test.js',
     '../test_tmp/unit/rx-schema.test.js',
     '../test_tmp/unit/key-compression.test.js',
+    '../test_tmp/unit/bug-report.test.js',
     '../test_tmp/unit/socket.test.js',
     '../test_tmp/unit/rx-database.test.js',
     '../test_tmp/unit/rx-collection.test.js',
@@ -35,8 +36,7 @@ const nodeAndBrowser = [
     '../test_tmp/unit/local-documents.test.js',
     '../test_tmp/unit/in-memory.test.js',
     '../test_tmp/unit/server.test.js',
-    '../test_tmp/unit/attachments.test.js',
-    '../test_tmp/unit/bug-report.test.js'
+    '../test_tmp/unit/attachments.test.js'
 ];
 
 const last = [
diff --git a/test/unit/rx-document.test.js b/test/unit/rx-document.test.js
index b30561f218f..9785e0fe8c5 100644
--- a/test/unit/rx-document.test.js
+++ b/test/unit/rx-document.test.js
@@ -12,7 +12,7 @@ import * as RxDocument from '../../dist/lib/rx-document';
 import * as RxDatabase from '../../dist/lib/index';
 
 config.parallel('rx-document.test.js', () => {
-    describe('statics', () => {});
+    describe('statics', () => { });
     describe('.get()', () => {
         describe('positive', () => {
             it('get a value', async () => {
@@ -39,7 +39,7 @@ config.parallel('rx-document.test.js', () => {
                 c.database.destroy();
             });
         });
-        describe('negative', () => {});
+        describe('negative', () => { });
     });
     describe('.set()', () => {
         describe('positive', () => {
@@ -762,5 +762,69 @@ config.parallel('rx-document.test.js', () => {
 
             db.destroy();
         });
+        it('#734 Invalid value persists in document after failed update', async () => {
+            // create a schema
+            const schemaEnum = ['A', 'B'];
+            const mySchema = {
+                version: 0,
+                type: 'object',
+                properties: {
+                    children: {
+                        type: 'array',
+                        items: {
+                            type: 'object',
+                            properties: {
+                                name: { type: 'string' },
+                                abLetter: {
+                                    type: 'string',
+                                    enum: schemaEnum,
+                                },
+                            }
+                        }
+                    }
+                }
+            };
+
+            // generate a random database-name
+            const name = util.randomCouchString(10);
+
+            // create a database
+            const db = await RxDB.create({
+                name,
+                adapter: 'memory',
+                ignoreDuplicate: true
+            });
+            // create a collection
+            const collection = await db.collection({
+                name: util.randomCouchString(10),
+                schema: mySchema
+            });
+
+            // insert a document
+            const doc = await collection.insert({
+                children: [
+                    { name: 'foo', abLetter: 'A' },
+                    { name: 'bar', abLetter: 'B' },
+                ],
+            });
+
+            const colDoc = await collection.findOne({ _id: doc._id }).exec();
+
+
+            try {
+                await colDoc.update({
+                    $set: {
+                        'children.1.abLetter': 'invalidEnumValue',
+                    },
+                });
+            } catch (err) {
+            }
+
+            assert.equal(colDoc.children[1].abLetter, 'B');
+
+
+            // clean up afterwards
+            db.destroy();
+        });
     });
 });