--- multilink.module.original	2012-01-16 16:30:17.000000000 -0800
+++ multilink.module.fixed	2012-01-16 16:28:45.000000000 -0800
@@ -323,8 +323,10 @@
     );
 
     // Merge settings from multilink_filter.
+    if (function_exists('_multilink_filter_default_settings')) {
     $defaults += _multilink_filter_default_settings();
   }
+  }
   return variable_get($mod_prefix.$key, @$defaults[$key]);
 }