common_config returns false if the config value is not set. Design::toWebColor checks with is_null. Hence the common_config value should be adjusted.

1 files changed, 4 insertions, 1 deletions

diff --git a/classes/Design.php b/classes/Design.php
index 9354bfcda..19c9e0292 100644
--- a/classes/Design.php
+++ b/classes/Design.php
@@ -204,7 +204,10 @@ class Design extends Memcached_DataObject
                            'disposition');
 
             foreach ($attrs as $attr) {
-                $siteDesign->$attr = common_config('design', $attr);
+                $val = common_config('design', $attr);
+                if ($val !== false) {
+                    $siteDesign->$attr = $val;
+                }
             }
         }