Ticket #35657: 35657.3.diff

src/wp-includes/js/wp-embed-template.js

@@ -26 +26 @@
                         share_dialog_close = document.querySelector( '.wp-embed-share-dialog-close' ),
                         share_input = document.querySelectorAll( '.wp-embed-share-input' ),
                         share_dialog_tabs = document.querySelectorAll( '.wp-embed-share-tab-button button' ),
+                        featured_image = document.querySelector( '.wp-embed-featured-image img' ),
                         i;
 
                 if ( share_input ) {
@@ -139 +140 @@
                 sendEmbedMessage( 'height', Math.ceil( document.body.getBoundingClientRect().height ) );
 
                 // Send the document's height again after the featured image has been loaded.
-                document.querySelector( '.wp-embed-featured-image img' ).addEventListener( 'load', function() {
-                        sendEmbedMessage( 'height', Math.ceil( document.body.getBoundingClientRect().height ) );
-                } );
+                if ( featured_image ) {
+                        featured_image.addEventListener( 'load', function() {
+                                sendEmbedMessage( 'height', Math.ceil( document.body.getBoundingClientRect().height ) );
+                        } );
+                }
 
                 /**
                  * Detect clicks to external (_top) links.