High CPU Usage When Activated

Hi,
I recently purchased your premium version of this plugin. And after activating the plugin, my CPU usage reached 100%. And I have verified this 5 times. When I deactivate, your plugin CPU Usage reduces to 5 to 10%.

On activating again, the CPU usage hit 100% again.
Check this image: https://ibb.co/R4MFwcV

I found these errors in my debug.log file.

[19-Sep-2022 02:48:53 UTC] PHP Notice: Undefined property: stdClass::$line_total in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart/cron/class-wcal-cron.php on line 517
[19-Sep-2022 02:48:53 UTC] PHP Notice: Undefined property: stdClass::$line_tax in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart/cron/class-wcal-cron.php on line 351
[19-Sep-2022 02:48:53 UTC] PHP Notice: Undefined property: stdClass::$line_total in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart/cron/class-wcal-cron.php on line 354

[20-Sep-2022 13:44:07 UTC] PHP Notice: Undefined property: stdClass::$line_tax in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/reports/abandoned-report-table.php on line 210
[20-Sep-2022 13:44:07 UTC] PHP Notice: Undefined property: stdClass::$line_total in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/reports/abandoned-report-table.php on line 211

[20-Sep-2022 13:57:43 UTC] PHP Notice: Trying to get property ‘status’ of non-object in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/execute/guest.php on line 214
[20-Sep-2022 13:57:45 UTC] PHP Notice: Trying to get property ‘status’ of non-object in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/execute/guest.php on line 214

[20-Sep-2022 14:17:17 UTC] PHP Notice: Undefined property: stdClass::$line_total in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/reports/reports.php on line 315
[20-Sep-2022 14:17:17 UTC] PHP Notice: Undefined property: stdClass::$line_tax in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/reports/reports.php on line 316
[20-Sep-2022 14:17:17 UTC] PHP Notice: Undefined property: stdClass::$line_total in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/reports/reports.php on line 320
[20-Sep-2022 14:17:17 UTC] PHP Notice: Undefined property: stdClass::$line_tax in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/reports/reports.php on line 320

[21-Sep-2022 11:19:17 UTC] PHP Notice: Undefined variable: lang_src in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/email/send-email-cron.php on line 663
[21-Sep-2022 11:19:17 UTC] PHP Notice: Undefined variable: lang_src in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/email/send-email-cron.php on line 665
[21-Sep-2022 11:19:18 UTC] PHP Notice: Undefined variable: lang_src in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/email/send-email-cron.php on line 663
[21-Sep-2022 11:19:18 UTC] PHP Notice: Undefined variable: lang_src in /home/example.com/public_html/wp-content/plugins/woocommerce-abandoned-cart-recovery/includes/email/send-email-cron.php on line 665

Can you please help?