diff --git a/plugins/cache/graceful.inc b/plugins/cache/graceful.inc
index 664bef019dbb097cc5c13b03cd58cda5abde88cb..ae76d9cb7aff7d04c5142358433ea686f9a49b59 100755
--- a/plugins/cache/graceful.inc
+++ b/plugins/cache/graceful.inc
@@ -25,6 +25,12 @@ $plugin = array(
  * Get cached content.
  */
 function cache_graceful_panels_cache_get_cache($conf, $display, $args, $contexts, $pane = NULL) {
+  if (!$pane) {
+    // Only pane caching is supported on D6, due to missing renderer_handler object on display object.
+    // @todo Fallback to timebased cache?
+    watchdog('cache_graceful', 'Graceful caching of display not supported', array(), WATCHDOG_ERROR);
+    return FALSE;
+  }
   $cid = cache_graceful_panels_cache_get_id($conf, $display, $args, $contexts, $pane);
   $cache = cache_graceful(
              $cid,