Index: temp/test-xoops.ec-cube.net/html/modules/newbb/viewforum.php
===================================================================
--- temp/test-xoops.ec-cube.net/html/modules/newbb/viewforum.php	(revision 470)
+++ temp/test-xoops.ec-cube.net/html/modules/newbb/viewforum.php	(revision 471)
@@ -339,6 +339,5 @@
 
 // ¥«¥Æ¥´¥ê̾¼èÆÀ
-$sql = "SELECT cat_id, cat_title FROM ".$xoopsDB->prefix("bb_categories").", ".$xoopsDB->prefix("bb_forums")." WHERE forum_id = $forum";
-
+$sql = "SELECT cat_id, cat_title FROM ".$xoopsDB->prefix("bb_categories")."c, ".$xoopsDB->prefix("bb_forums")."f WHERE c.cat_id = f.cat_id AND forum_id = $forum";
 
 if ( !$result = $xoopsDB->query($sql) ) {