Fatal Error in combination with wp-lister pro

Hi I just wanted to let you know that there is an issue ( I solved by switching your plug in off) in combination with the wp-lister pro plug in.
You might want to look into this.
Please find below the error message I get.
[07-Nov-2018 12:06:19 UTC] PHP Fatal error: Uncaught Error: Call to a member function get_customer_id() on null in /www/htdocs/w0112d88/stokedforlife.org/wp-content/plugins/wc-abandoned-carts-by-small-fish-analytics/class-sfa-abandoned-carts-recorder.php:38