$nt may or may not be an object

diff --git a/languages/LanguageConverter.php b/languages/LanguageConverter.php
index 91f2fa9..be76107 100644 (file)
--- a/languages/LanguageConverter.php
+++ b/languages/LanguageConverter.php
@@ -566,7 +566,7 @@ class LanguageConverter {
        function findVariantLink( &$link, &$nt, $ignoreOtherCond = false ) {
                # If the article has already existed, there is no need to
                # check it again, otherwise it may cause a fault.
-               if ( $nt->exists() )
+               if ( is_object( $nt ) && $nt->exists() )
                        return;
 
                global $wgDisableLangConversion, $wgDisableTitleConversion, $wgRequest, $wgUser;