Undefined array key in wp-includes/class-wp-list-util.php-CodePudding

I'm getting an error when I click on the abandoned cart email link.

Warning: Undefined array key "line_total" in wp-includes/class-wp-list-util.php on line 169

CodePudding user response：

There is 4 method to fix this error:

1: Go To Dashboard -> Update -> On You have the latest version of WordPress, click Re-Install Now.

2: try to use the default WordPress theme to see if your current theme causes this error.

3: Sounds like you are using an incompatible plugin, try disabling plugins one by one to find which plugin causes this error.

4: Finally you may disable wp_debug to ignore this error, go to wp-config.php and find and set it to disable like the example below:

define( 'WP_DEBUG', false);