diff -Naur old/wp-admin/customize.php new/wp-admin/customize.php
--- old/wp-admin/customize.php	2018-02-06 10:04:52.489896000 +0530
+++ new/wp-admin/customize.php	2018-03-08 15:43:26.484145429 +0530
@@ -177,7 +177,7 @@
 			<?php $save_text = $wp_customize->is_theme_active() ? __( 'Publish' ) : __( 'Activate &amp; Publish' ); ?>
 			<div id="customize-save-button-wrapper" class="customize-save-button-wrapper" >
 				<?php submit_button( $save_text, 'primary save', 'save', false ); ?>
-				<button id="publish-settings" class="publish-settings button-primary button dashicons dashicons-admin-generic" aria-label="<?php esc_attr_e( 'Publish Settings' ); ?>" aria-expanded="false" disabled></button>
+				<button id="publish-settings" class="publish-settings button-primary button dashicons dashicons-admin-generic" aria-label="<?php esc_attr_e( 'Publish Settings' ); ?>" aria-expanded="false" disabled="disabled"></button>
 			</div>
 			<span class="spinner"></span>
 			<button type="button" class="customize-controls-preview-toggle">