diff --git src/wp-includes/js/media-models.js src/wp-includes/js/media-models.js
index 21b42b4..53eefdf 100644
--- src/wp-includes/js/media-models.js
+++ src/wp-includes/js/media-models.js
@@ -472,7 +472,7 @@ window.wp = window.wp || {};
 		setAspectRatio: function() {
 			var full;
 
-			if ( this.attachment ) {
+			if ( this.attachment && this.attachment.get( 'sizes' ) ) {
 				full = this.attachment.get( 'sizes' ).full;
 
 				if ( full ) {