Index: install/install_toolkit.php
===================================================================
--- install/install_toolkit.php	(revision 13367)
+++ install/install_toolkit.php	(working copy)
@@ -310,8 +310,10 @@
 			$sqls = str_replace('CREATE TABLE ', 'CREATE TABLE IF NOT EXISTS ' . $table_prefix, $sqls);
 			$sqls = str_replace('DROP TABLE ', 'DROP TABLE IF EXISTS ' . $table_prefix, $sqls);
 			$sqls = str_replace('<%TABLE_PREFIX%>', $table_prefix, $sqls);
-			$sqls = str_replace('<%PRIMARY_LANGUAGE%>', $this->Application->GetDefaultLanguageId(), $sqls);
 
+			$primary_language = is_object($this->Application) ? $this->Application->GetDefaultLanguageId() : 1;
+			$sqls = str_replace('<%PRIMARY_LANGUAGE%>', $primary_language, $sqls);
+
 			if (isset($replace_from) && isset($replace_to)) {
 				// replace something additionally, e.g. module root category
 				$sqls = str_replace($replace_from, $replace_to, $sqls);