diff -Naur wordpress/wp-includes/post.php wordpress/wp-includes/post.php
--- wordpress/wp-includes/post.php	2018-11-21 14:35:05.204818000 +0530
+++ wordpress/wp-includes/post.php	2018-11-21 14:35:52.231575012 +0530
@@ -4394,7 +4394,7 @@
 		$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );
 
 		if ( strlen( $excerpt ) > 255 ) {
-			$excerpt = substr( $excerpt, 0, 252 ) . '…';
+			$excerpt = mb_substr( $excerpt, 0, 252 ) . '…';
 		}
 
 		$trackback_urls = explode( ',', $tb_list );