I confirm, I have such mistakes too:
Notice: Trying to access array offset on value of type bool in D:\WebDev\ospanel\OpenServer\domains\site.com\wp-content\plugins\stock-locations-for-woocommerce\src\classes\class-slw-stock-locations-tab.php on line 37
Notice: Trying to access array offset on value of type bool in D:\WebDev\ospanel\OpenServer\domains\site.com\wp-content\plugins\stock-locations-for-woocommerce\src\classes\class-slw-cart.php on line 31
Notice: Trying to access array offset on value of type bool in D:\WebDev\ospanel\OpenServer\domains\site.com\wp-content\plugins\stock-locations-for-woocommerce\src\classes\class-slw-cart.php on line 39
Warning: Cannot modify header information – headers already sent by (output started at D:\WebDev\ospanel\OpenServer\domains\site.com\wp-content\plugins\stock-locations-for-woocommerce\src\classes\class-slw-stock-locations-tab.php:37) in D:\WebDev\ospanel\OpenServer\domains\site.com\wp-includes\functions.php on line 6270
Warning: Cannot modify header information – headers already sent by (output started at D:\WebDev\ospanel\OpenServer\domains\site.com\wp-content\plugins\stock-locations-for-woocommerce\src\classes\class-slw-stock-locations-tab.php:37) in D:\WebDev\ospanel\OpenServer\domains\site.com\wp-admin\includes\misc.php on line 1310
Warning: Cannot modify header information – headers already sent by (output started at D:\WebDev\ospanel\OpenServer\domains\site.com\wp-content\plugins\stock-locations-for-woocommerce\src\classes\class-slw-stock-locations-tab.php:37) in D:\WebDev\ospanel\OpenServer\domains\site.com\wp-admin\admin-header.php on line 9