diff --git a/src/decouplededitor.js b/src/decouplededitor.js
index b30e569..a2e1c1c 100644
--- a/src/decouplededitor.js
+++ b/src/decouplededitor.js
@@ -14,6 +14,7 @@ import DecoupledEditorUI from './decouplededitorui';
 import DecoupledEditorUIView from './decouplededitoruiview';
 import getDataFromElement from '@ckeditor/ckeditor5-utils/src/dom/getdatafromelement';
 import setDataInElement from '@ckeditor/ckeditor5-utils/src/dom/setdatainelement';
+import ElementApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/elementapimixin';
 import mix from '@ckeditor/ckeditor5-utils/src/mix';
 import { isElement } from 'lodash-es';
 import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
@@ -47,6 +48,7 @@ import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
  * {@link module:editor-decoupled/decouplededitor~DecoupledEditor.create `DecoupledEditor.create()`}.
  *
  * @mixes module:core/editor/utils/dataapimixin~DataApiMixin
+ * @mixes module:core/editor/utils/elementapimixin~ElementApiMixin
  * @implements module:core/editor/editorwithui~EditorWithUI
  * @extends module:core/editor/editor~Editor
  */
@@ -68,6 +70,7 @@ export default class DecoupledEditor extends Editor {
 
 		if ( isElement( sourceElementOrData ) ) {
 			this.sourceElement = sourceElementOrData;
+			this.secureSourceElement();
 		}
 
 		this.data.processor = new HtmlDataProcessor();
@@ -252,6 +255,7 @@ export default class DecoupledEditor extends Editor {
 }
 
 mix( DecoupledEditor, DataApiMixin );
+mix( DecoupledEditor, ElementApiMixin );
 
 function getInitialData( sourceElementOrData ) {
 	return isElement( sourceElementOrData ) ? getDataFromElement( sourceElementOrData ) : sourceElementOrData;
diff --git a/tests/decouplededitor.js b/tests/decouplededitor.js
index eab6fa3..39c3377 100644
--- a/tests/decouplededitor.js
+++ b/tests/decouplededitor.js
@@ -15,12 +15,14 @@ import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
 import Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';
 import Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';
 import DataApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/dataapimixin';
+import ElementApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/elementapimixin';
 import RootElement from '@ckeditor/ckeditor5-engine/src/model/rootelement';
 
 import testUtils from '@ckeditor/ckeditor5-core/tests/_utils/utils';
 
 import { describeMemoryUsage, testMemoryUsage } from '@ckeditor/ckeditor5-core/tests/_utils/memory';
 import ArticlePluginSet from '@ckeditor/ckeditor5-core/tests/_utils/articlepluginset';
+import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
 import { assertCKEditorError } from '@ckeditor/ckeditor5-utils/tests/_utils/utils';
 
 const editorData = '<p><strong>foo</strong> bar</p>';
@@ -47,6 +49,10 @@ describe( 'DecoupledEditor', () => {
 			expect( testUtils.isMixed( DecoupledEditor, DataApiMixin ) ).to.be.true;
 		} );
 
+		it( 'has an Element Interface', () => {
+			testUtils.isMixed( DecoupledEditor, ElementApiMixin );
+		} );
+
 		it( 'creates main root element', () => {
 			expect( editor.model.document.getRoot( 'main' ) ).to.instanceof( RootElement );
 		} );
@@ -125,6 +131,20 @@ describe( 'DecoupledEditor', () => {
 			} );
 		} );
 
+		// See: https://github.com/ckeditor/ckeditor5/issues/746
+		it( 'should throw when trying to create the editor using the same source element more than once', () => {
+			const sourceElement = document.createElement( 'div' );
+
+			return DecoupledEditor.create( sourceElement )
+				.then( editor => {
+					expect( () => {
+						new DecoupledEditor( sourceElement ); // eslint-disable-line no-new
+					} ).to.throw( CKEditorError, /^editor-source-element-used-more-than-once/ );
+
+					return editor.destroy();
+				} );
+		} );
+
 		it( 'throws if initial data is passed in Editor#create and config.initialData is also used', done => {
 			DecoupledEditor.create( '<p>Hello world!</p>', {
 				initialData: '<p>I am evil!</p>',