Ticket #40010: 40010.1.diff

src/wp-includes/customize/class-wp-customize-site-icon-control.php

@@ -67 +67 @@
                                                         <img src="<?php echo esc_url( admin_url( 'images/' . ( is_rtl() ? 'browser-rtl.png' : 'browser.png' ) ) ); ?>" class="browser-preview" width="182" alt="" />
 
                                                         <div class="favicon">
-                                                                <img src="{{ data.attachment.sizes.full.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>
+                                                                <img src="{{ data.attachment.sizes.full ? data.attachment.sizes.full.url : data.attachment.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>
                                                         </div>
                                                         <span class="browser-title" aria-hidden="true"><?php bloginfo( 'name' ); ?></span>
                                                 </div>
-                                                <img class="app-icon-preview" src="{{ data.attachment.sizes.full.url }}" alt="<?php esc_attr_e( 'Preview as an app icon' ); ?>"/>
+                                                <img class="app-icon-preview" src="{{ data.attachment.sizes.full ? data.attachment.sizes.full.url : data.attachment.url }}" alt="<?php esc_attr_e( 'Preview as an app icon' ); ?>"/>
                                         </div>
                                 <# } #>
                                 <div class="actions">