When using PHP 5.6.19 in 3.2.2 version i don't see an error, but when i switch to 7+

[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/debug/error_handler.php on line 18: Declaration of phpbb/debug/error_handler::handleError($type, $message, $file, $line, array $context, array $backtrace = NULL) should be compatible with Symfony/Component/Debug/ErrorHandler::handleError($type, $message, $file, $line).

It's not a problem, if developing with php 5.6+, but it may hurt eyes in higher versions of php)