Index: branches/RC/core/install/step_templates/upgrade_modules.tpl
===================================================================
diff -u -N -r10832 -r10836
--- branches/RC/core/install/step_templates/upgrade_modules.tpl	(.../upgrade_modules.tpl)	(revision 10832)
+++ branches/RC/core/install/step_templates/upgrade_modules.tpl	(.../upgrade_modules.tpl)	(revision 10836)
@@ -19,7 +19,7 @@
 <?php
 	$module_tpl = ob_get_clean();
 
-	$selected = $this->GetVar('modules');
+	$selected = $this->GetVar('modules') ? $this->GetVar('modules') : Array ();
 	$modules = $this->GetUpgradableModules();
 	foreach ($modules as $module_name => $module_params) {
 		$module_name = strtolower($module_name);