Ticket #40931: 40931.diff

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

@@ -30 +30 @@
                         $meta = wp_get_attachment_metadata( $thumbnail_id );
                         if ( ! empty( $meta['sizes'] ) ) {
                                 foreach ( $meta['sizes'] as $size => $data ) {
-                                        if ( $data['width'] / $data['height'] > $aspect_ratio ) {
+                                        if ( ($data['width'] > 0 && $data['height'] > 0) && $data['width'] / $data['height'] > $aspect_ratio ) {
                                                 $aspect_ratio = $data['width'] / $data['height'];
                                                 $measurements = array( $data['width'], $data['height'] );
                                                 $image_size   = $size;