Malformed AS_PATH error

Hi, I am seeing this error message in bird's log and I am unable to find reason. <RMT> PEER: Error: Malformed AS_PATH: 40022002080000b8800000b8800000b8 Weird thing is that if my peer sends me just his prefixes everything is alright. When he sends me full IP table and I apply filter to accept just my peer prefixes, the error occurs again. I have theory, that when BIRD reads route with a malformed path even if he does not accept it, it drops BGP connection with this error. So I have 2 questions. Am I correct in my theory? And if so is there way around it? best regards, Tomas Jirik