Invalid characters passed for attempted conversion, these have been ignored - Pushing Laravel project to heroku
Upgrading the dompdf/dompdf to version 0.8.5 will solve this issue: https://github.com/dompdf/dompdf/releases
Installing the latest version can be done with:
composer require dompdf/dompdf
or modifying composer.json manually to 0.8.5 and running:
composer install
Keep in mind this upgrade may contain breaking changes