Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.734
diff -u -r1.734 common.inc
--- includes/common.inc	12 Dec 2007 14:54:27 -0000	1.734
+++ includes/common.inc	14 Dec 2007 05:26:27 -0000
@@ -3317,6 +3317,9 @@
  *   hook_schema().
  */
 function _drupal_initialize_schema($module, &$schema) {
+  if (!is_array($schema)) {
+    $schema = array();
+  }
   // Set the name and module key for all tables.
   foreach ($schema as $name => $table) {
     if (empty($table['module'])) {