Index: adserve.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/ad/Attic/adserve.inc,v
retrieving revision 1.1.2.26
diff -u -p -r1.1.2.26 adserve.inc
--- adserve.inc	11 Jul 2008 14:42:18 -0000	1.1.2.26
+++ adserve.inc	29 Jul 2008 09:24:42 -0000
@@ -428,10 +428,10 @@ function adserve_invoke_hook($hook, $a1 
   else {
     _debug_echo("Invoking adserve hook '$hook'.");
     // Get information from Drupal variable table.
-    $actions = variable_get($hook);
+    $actions = variable_get($hook,'');
     $return = array();
     if (!empty($actions)) {
-      $actions = unserialize(variable_get($hook));
+      $actions = unserialize(variable_get($hook,''));
       foreach ($actions as $name => $action) {
         if ($action['function']) {
           $function = $action['function'];