PHP Fatal Errors iin plugin

Hello, my nginx php-fpm log is suddenly full of these messages:

[error] 26490#26490: *3 FastCGI sent in stderr: "PHP message: PHP Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /home/MYSITE/cms/wp-content/plugins/amazon-s3-and-cloudfront/classes/as3cf-notices.php on line 354" while reading upstream,...

Is there any fix for this? Thank you.