Receiving PHP 8 Errors

With PHP 7.4 EOL approaching, we are preparing our WordPress sites to upgrade to PHP 8. We are receiving the following PHP 8 errors for this plugin.

FOUND 2 ERRORS AFFECTING 2 LINES ———————————————————————- 358 | ERROR | Using an unparenthesized expression containing a “.” | | before a “+” or “-” has been deprecated in PHP 7.4 and | | removed in PHP 8.0 424 | ERROR | Using an unparenthesized expression containing a “.” | | before a “+” or “-” has been deprecated in PHP 7.4 and | | removed in PHP 8.0