Index: branches/version-2_12-dev/data/class/helper/SC_Helper_Plugin.php
===================================================================
--- branches/version-2_12-dev/data/class/helper/SC_Helper_Plugin.php	(revision 21927)
+++ branches/version-2_12-dev/data/class/helper/SC_Helper_Plugin.php	(revision 21941)
@@ -78,5 +78,5 @@
      * @return object SC_Helper_Pluginオブジェクト
      */
-    function getSingletonInstance($plugin_activate_flg = true) {
+    static function getSingletonInstance($plugin_activate_flg = true) {
         if (!isset($GLOBALS['_SC_Helper_Plugin_instance']) || is_null($GLOBALS['_SC_Helper_Plugin_instance'])) {
             // プラグインのローダーがDB接続を必要とするため、