Index: themes/engines/phptemplate/phptemplate.engine
===================================================================
RCS file: /cvs/drupal/drupal/themes/engines/phptemplate/phptemplate.engine,v
retrieving revision 1.48
diff -u -r1.48 phptemplate.engine
--- themes/engines/phptemplate/phptemplate.engine	11 Sep 2006 08:20:23 -0000	1.48
+++ themes/engines/phptemplate/phptemplate.engine	12 Oct 2006 12:45:32 -0000
@@ -63,7 +63,7 @@
     $variables = array_merge($variables, call_user_func($variables_function, $hook, $variables));
   }
 
-  if (is_array($variables['template_files'])) {
+  if (isset($variables['template_files']) && is_array($variables['template_files'])) {
     $suggestions = array_merge($suggestions, $variables['template_files']);
   }