Index: sites/all/modules/contrib/panels/plugins/display_renderers/panels_renderer_legacy.class.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- sites/all/modules/contrib/panels/plugins/display_renderers/panels_renderer_legacy.class.php	(revision a28619aa35b78b06509f2175f8040c68a1be0cf5)
+++ sites/all/modules/contrib/panels/plugins/display_renderers/panels_renderer_legacy.class.php	(revision )
@@ -239,7 +239,7 @@
     }
 
     // Pass long the css_class that is usually available.
-    if (!empty($pane->css['css_class'])) {
+    if (!empty($pane->css['css_class']) && is_object($content)) {
       $content->css_class = $pane->css['css_class'];
     }