PHP error

Hello,

We constantly have PHP errors as follows:

[19-Nov-2022 10:20:02 UTC] PHP Deprecated: Return type of FluentSupport\Framework\Database\Orm\Model::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/wp-content/plugins/fluent-support/vendor/wpfluent/framework/src/WPFluent/Database/Orm/Model.php on line 2449

Thanks for your help.