[exim] Avast and invalid response from scanner

Hi list!

I see very often this message in exim paniclog:

malware acl condition: avast /var/run/avast/scan.sock : invalid  
response from scanner: 'SCAN  
/var/spool/exim4/scan/1ew39J-0002Qa-4m/1ew39J-0002Qa-4m-00004|>somefile      
[E]1.0  Error 42110 The\ file\ is\ a\ decompression\ bomb'

It seems that I cannot disable this warning in Avast and I didn't
found any option in Exim to disable it.
Can someone help me?

Thanks
Luca Bertoncello
(lucabert@???)