Fixed search engine issue

diff --git a/wcfsetup/install/files/lib/system/search/SearchEngine.class.php b/wcfsetup/install/files/lib/system/search/SearchEngine.class.php
index 321b60801e8202f997c2426755b6a61db2f74a1b..4d54683397e46507a181df7b8e5267602b30ff57 100644 (file)
--- a/wcfsetup/install/files/lib/system/search/SearchEngine.class.php
+++ b/wcfsetup/install/files/lib/system/search/SearchEngine.class.php
@@ -83,7 +83,7 @@ class SearchEngine extends SingletonFactory {
                        $controlCharacterOrSpace = false;
                        $chars = array('+', '-', '*');
                        for ($i = 0, $length = mb_strlen($q); $i < $length; $i++) {
-                               $char = $q[$i];
+                               $char = mb_substr($q, $i, 1);
                                
                                if ($inQuotes) {
                                        if ($char == '"') {