monkey webserver doesn't work at amd64

[psl]

Ubuntu 12.04.3 amd64
monkey_0.9.3-1ubuntu1_amd64.deb

monkey webserver doesn't work at PC with amd64. It reports invalid memory reference and returns zero size replies to http client (Error code: ERR_EMPTY_RESPONSE)

# /usr/bin/monkey -c /etc/monkey
Monkey HTTP Daemon 0.9.3
Built : Sep 7 2011 00:16:37
Home : http://www.monkey-project.com
[18/Sep/2013 23:07:41 +0000] => Invalid memory reference
[18/Sep/2013 23:10:22 +0000] => Invalid memory reference
[18/Sep/2013 23:10:24 +0000] => Invalid memory reference
[18/Sep/2013 23:10:26 +0000] => Invalid memory reference
[18/Sep/2013 23:10:29 +0000] => Invalid memory reference
[18/Sep/2013 23:10:33 +0000] => Invalid memory reference
[18/Sep/2013 23:10:39 +0000] => Invalid memory reference
[18/Sep/2013 23:10:45 +0000] => Invalid memory reference

I tried monkey at i386 and it works better there, so there is some problem specific to amd64...