Ticket #36838: 36838.diff

src/wp-includes/theme-compat/embed-content.php

@@ -27 +27 @@
                 $image_size   = 'full'; // Fallback.
 
                 $meta = wp_get_attachment_metadata( $thumbnail_id );
-                if ( is_array( $meta ) ) {
+                if ( ! empty( $meta['sizes'] ) ) {
                         foreach ( $meta['sizes'] as $size => $data ) {
                                 if ( $data['width'] / $data['height'] > $aspect_ratio ) {
                                         $aspect_ratio = $data['width'] / $data['height'];