KOLAB: PHP Warning rcube_cache: max_packet_size

[Martin Teufel]

My http ssl_error shows a lot of the following errors:
	PHP Warning:  rcube_cache: max_packet_size (1046576) exceeded for
key 12518380675452b6a387091776... 
	Tried to write 1419308 bytes in
usr/share/roundcubemail/program/lib/Roundcube/rcube_cache.php on line 335,
referer: https://xxxx.xx.xx/roundcubemail...

Can somebody help me with that issue?

Thanks
Martin