SpamAssassin version 3.0.0-r10051

"make test" generates failures in t/spamd_maxchildren, t/spamd_parallel, and 
t/whitelist_addrs.  Last test from t/log/spamd_maxchildren-spamd.err:

logmsg: connection from localhost.localdomain [127.0.0.1] at port 32928
logmsg: Still running as root: user not specified with -u, not found, or set to 
root.  Fall back to nobody.
logmsg: processing message <9PS291LhupY> for root:99.
debug: ---- MIME PARSER START ----
debug: main message type: text/plain
debug: parsing normal part
debug: added part, type: text/plain
debug: ---- MIME PARSER END ----
debug: bayes: no dbs present, cannot tie DB R/O: ./log/user_state/bayes_toks
debug: received-header: parsed as [ ip=193.120.211.219 rdns=mail.webnote.net 
helo=webnote.net by=mail.netnoteinc.com ident= envfrom= intl=0 id=09C18114095 ]
debug: received-header: parsed as [ ip=24.226.157.50 rdns=USR-157-050.dr.
cgocable.ca helo=netsvr.Internet by=webnote.net ident= envfrom= intl=0 
id=IAA29903 ]
debug: received-header: parsed as [ ip=216.214.106.173 rdns=max1-45.losangeles.
corecomm.net helo=R00UqS18S by=netsvr.Internet ident= envfrom= intl=0 
id=1429NTL5 ]
Can't call method "get_num_nets" on unblessed reference at ..
/blib/lib/Mail/SpamAssassin/Received.pm line 96, <GEN2> line 39.
logmsg: server killed by SIGTERM, shutting down

The "Can't call method "get_num_nets" on unblessed reference" error appears for 
each test that fails.

Data::Dumper output of $spam->{conf}, called just before that line in Received.
pm, shows this :

                 'trusted_networks' => {
                                         'nets' => undef
                                       },