PHP (!) Notice displayed on Dashboard / Updates screen

Activate WordPress debugging in wp-config.php

define(‘WP_DEBUG’, true);
define(‘WP_DEBUG_LOG’, true);
define(‘WP_DEBUG_DISPLAY’, true);

Login, goto Dashboard
goto Updates (wp-admin/update-core.php)

Get PHP Notice:

( ! ) Notice: Undefined index: action in C:\Users\dlingren\Documents\My Data\Data Files\Web Design\VirtualHosts\wpectest\wp-content\plugins\wp-db-backup\wp-db-backup.php on line 214
Call Stack
# Time Memory Function Location
1 0.0361 310096 {main}( ) ..\update-core.php:0
2 0.0373 406976 require_once( ‘C:\Users\dlingren\Documents\My Data\Data Files\Web Design\VirtualHosts\wpectest\wp-admin\admin.php’ ) ..\update-core.php:10
3 0.9261 48747896 do_action( ) ..\admin.php:213
4 1.6920 48803376 call_user_func_array ( ) ..\plugin.php:403
5 1.6920 48803552 wpdbBackup->update_notice_action( ) ..\plugin.php:0

To fix, change line 214 from

if ( 'upgrade-core' == $_REQUEST['action'] ) :

to

if ( isset( $_REQUEST['action'] ) && ( 'upgrade-core' == $_REQUEST['action'] ) ) :

https://www.ads-software.com/extend/plugins/wp-db-backup/