Fatal error: Call to undefined function update_get_available() in modules/update/update.install

The following error start happening on all Drupal pages:

( ! ) Fatal error: Call to undefined function update_get_available() in modules/update/update.install on line 31
Call Stack
2	menu_execute_active_handler( $path = ???, $deliver = ??? )	../index.php:21
3	call_user_func_array:{includes/menu.inc:527} ( 'system_admin_config_page', array () )	../menu.inc:527
4	system_admin_config_page( )	../menu.inc:527
5	system_status( $check = TRUE )	../system.admin.inc:13
6	module_invoke_all( $hook = 'requirements', 'runtime' )	../system.admin.inc:2334
7	call_user_func_array:{includes/module.inc:934} ( 'update_requirements', array (1 => 'runtime') )	../module.inc:934
8	update_requirements( $phase = 'runtime' )	../module.inc:934
Variables in local scope (#8)
$available =
Undefined
$data =
Undefined
$first_project =
Undefined
$phase =
string 'runtime' (length=7)
$requirements =
array (size=0)
  empty

Clearing cache seems to helped.