id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
20603	"Warning error occurs on the default parameter of ""admin-head-callback"" in add_theme_support."	jim912	nacin	"When you make settings of custom header using add_theme_support on functions.php of a theme, if you use default value without defining admin-head-callback, warning error occurs as follows on admin screen of custom header.

{{{
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '' not found or invalid function name in path-to-wordpress-root/wp-includes/plugin.php on line 403
}}}

To fix this, I think better to change default value of admin-head-callback into  `__return_false`, on /wp-includes/theme.php. Here's patch."	defect (bug)	closed	high	3.4	Themes	3.4	major	fixed	has-patch