Index: branches/version-2_12-dev/html/install/index.php
===================================================================
--- branches/version-2_12-dev/html/install/index.php	(revision 22042)
+++ branches/version-2_12-dev/html/install/index.php	(revision 22071)
@@ -28,5 +28,5 @@
 define('INSTALL_FUNCTION', true);
 define('INSTALL_INFO_URL', 'http://www.ec-cube.net/install_info/index.php');
-if (ob_get_level() > 0) {
+if (ob_get_level() > 0 && ob_get_length() > 0) {
     while (ob_end_clean());
 }