--- wp-content/themes/twentyfourteen/inc/template-tags.php.OLD	2014-12-09 21:57:24.000000000 +0300
+++ wp-content/themes/twentyfourteen/inc/template-tags.php	2015-02-19 02:22:18.000000000 +0300
@@ -161,6 +161,7 @@
 add_action( 'edit_category', 'twentyfourteen_category_transient_flusher' );
 add_action( 'save_post',     'twentyfourteen_category_transient_flusher' );
 
+if ( ! function_exists( 'twentyfourteen_post_thumbnail' ) ) :
 /**
  * Display an optional post thumbnail.
  *
@@ -201,6 +202,7 @@
 
 	<?php endif; // End is_singular()
 }
+endif;
 
 if ( ! function_exists( 'twentyfourteen_excerpt_more' ) && ! is_admin() ) :
 /**