Merge branch 'dev' of https://github.com/artf/grapesjs into dev

src/canvas/index.js

@@ -407,7 +407,11 @@ module.exports = () => {
      * @private
      */
     isInputFocused() {
-      return this.getFrameEl().contentDocument.activeElement.tagName !== 'BODY';
+      let contentDocument = this.getFrameEl().contentDocument;
+      return (
+        contentDocument.activeElement &&
+        contentDocument.activeElement.tagName !== 'BODY'
+      );
     },
 
     /**