Index: /trunk/xpressme_integration_kit/wp-content/plugins/xpressme/include/custom_functions.php
===================================================================
--- /trunk/xpressme_integration_kit/wp-content/plugins/xpressme/include/custom_functions.php	(revision 687)
+++ /trunk/xpressme_integration_kit/wp-content/plugins/xpressme/include/custom_functions.php	(revision 688)
@@ -599,5 +599,9 @@
 	$text = str_replace(']]>', ']]>', $text);
 	$text = strip_tags($text);
-	$is_almost_ascii = ($xpress_config->ascii_judged_rate < round(@(mb_strlen($text, $blog_encoding) / strlen($text)) * 100)) ? true : false;
+	if (function_exists('mb_strlen') && function_exists('mb_substr')){
+		$is_almost_ascii = ($xpress_config->ascii_judged_rate < round(@(mb_strlen($text, $blog_encoding) / strlen($text)) * 100)) ? true : false;
+	} else {
+		$is_almost_ascii = true;
+	}
 	if($is_almost_ascii) {
 		$words = explode(' ', $text, $excerpt_length_word + 1);