We keep receiving the following error when we work on the dashboard

Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /home/customer/www/kevinj110.sg-host.com/public_html/wp-content/themes/voxel/app/product-types/vendor-stats.php on line 576

Deprecated: strtoupper(): Passing null to parameter #1 ($string) of type string is deprecated in /home/customer/www/kevinj110.sg-host.com/public_html/wp-content/themes/voxel/app/stripe/currencies.php on line 174

Deprecated: NumberFormatter::formatCurrency(): Passing null to parameter #2 ($currency) of type string is deprecated in /home/customer/www/kevinj110.sg-host.com/public_html/wp-content/themes/voxel/app/utils/utils.php on line 382

Deprecated: strtoupper(): Passing null to parameter #1 ($string) of type string is deprecated in /home/customer/www/kevinj110.sg-host.com/public_html/wp-content/themes/voxel/app/stripe/currencies.php on line 174

Deprecated: NumberFormatter::formatCurrency(): Passing null to parameter #2 ($currency) of type string is deprecated in /home/customer/www/kevinj110.sg-host.com/public_html/wp-content/themes/voxel/app/utils/utils.php on line 382