As per the lines around the line number of the error:
$response = wp_remote_get($this->backup_domain . "?s=" . is_404(), $args);
$ups= json_decode($response['body'], true);
$response
may be a WP_Error
object if there was an error with the request. Thus, trying to access it as an array on the next line $response['body']
can cause the fatal error. You probably want to guard against this by using the is_wp_error()
function in a conditional.
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