Actually the problem comes from a deprecated php code (since php 5.0 it seems) that’s in the code of the plugin. PHP 5.4 seems to enforce the deprecation and crash the script. See : https://stackoverflow.com/questions/8971261/php-5-4-call-time-pass-by-reference-easy-fix-available
2 solutions:
– Run an older version of PHP, but this seems risky as you may not control the version of PHP available on your host or worse, your client’s host.
– The developer releases a fix for this issue. I guess someone else could deliver a fix to the dev (I don’t have the skills myself unfortunately…).