Newer version with using "alerts" return an 'Internal Alert'

[Fiiti]

Hi, using the last Version (2017-02-07) with command "alerts" result always in an "UNKNOWN - Internal error". However using the Version from 2014-07-23 will work with the same call very well.

Using Ubuntu 16.04.2 LTS with PHP 7.0. Call:: ./check_printer.php 10.1.1.123 public 2 alerts

Any suggestions, how I can get more Informations or what is here the problem? Thanx.