roundcubemail incompatible with php-5.6

[Thomas Spuhler]

this was tread upgrading from 3.0 to 3.3, but has nothing to do with upgrading kolab

I am still working on this and I think I am honing in on the problem:
I upgraded everything but not:
Roundcubemail
php (to php2.6)
apache

and I have not problem to login. After updating php and apache, I get the following error in the 
journalctl  httpd.service
Jan 14 17:59:41 vbox.btspuhler.com suhosin[4907]: ALERT - ASCII-NUL chars not allowed within request 
variables - dropped variable '_url' (attacker '127.0.0.1', file '/usr/share/roundcubemail/index.php')
Jan 14 17:59:41 vbox.btspuhler.com suhosin[4907]: ALERT - dropped 1 request variables - (0 in GET, 1 
in POST, 0 in COOKIE) (attacker '127.0.0.1', file '/usr/share/roundcubemail/index.php')

Has anybody else experienced this? 

-- 
Best regards
Thomas Spuhler

All of my e-mails have a valid digital signature
ID 60114E63
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