Fix Uncaught TypeError: Cannot read property 'nodeType' of null at ed…

…… (#2330)

Summary:
facebookarchive/draft-js#2204
Pull Request resolved: facebookarchive/draft-js#2330

Reviewed By: claudiopro

Differential Revision: D20582792

Pulled By: mrkev

fbshipit-source-id: d96beaa1617ef82ba5663637f5daad254d9b17f7

src/component/handlers/edit/editOnInput.js

@@ -69,8 +69,8 @@ function editOnInput(editor: DraftEditor, e: SyntheticInputEvent<>): void {
 
   const {anchorNode, isCollapsed} = domSelection;
   const isNotTextOrElementNode =
-    anchorNode.nodeType !== Node.TEXT_NODE &&
-    anchorNode.nodeType !== Node.ELEMENT_NODE;
+    anchorNode?.nodeType !== Node.TEXT_NODE &&
+    anchorNode?.nodeType !== Node.ELEMENT_NODE;
 
   if (isNotTextOrElementNode) {
     // TODO: (t16149272) figure out context for this change