Fixed Code Improovement

Author: niravkrish

app/code/Magento/Swatches/view/frontend/web/js/swatch-renderer.js

@@ -1223,7 +1223,6 @@ define([
                 }
 
                 imagesToUpdate = this._setImageIndex(imagesToUpdate);
-                
                 if (gallery === undefined) {
                     context.find(this.options.mediaGallerySelector).on('gallery:loaded', function (loadedGallery) {
                         loadedGallery = context.find(this.options.mediaGallerySelector).data('gallery');
@@ -1242,7 +1241,14 @@ define([
                     });
                 }
 
-                gallery.first();
+                if (gallery === undefined) {
+                    context.find(this.options.mediaGallerySelector).on('gallery:loaded', function (loadedGallery) {
+                        loadedGallery = context.find(this.options.mediaGallerySelector).data('gallery');
+                        loadedGallery.first();
+                    }.bind(this));
+                } else {
+                    gallery.first();
+                }
 
             } else if (justAnImage && justAnImage.img) {
                 context.find('.product-image-photo').attr('src', justAnImage.img);