[Exim] LDAP segmentation fault...

I'm attempting to get exim working with LDAP on a Solaris 9 box running
v4.20

the following is an output of a debug log...
[root@dev-smtp01 /var/log]# /usr/exim/bin/exim -d -bt tk@???
Exim version 4.20 uid=0 gid=1 pid=7602 D=fbb95cfd
Probably ndbm
Support for:
Authenticators: plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mbx autoreply pipe smtp
changed uid/gid: forcing real = effective
uid=0 gid=1 pid=7602
auxiliary group list: <none>
configuration file is /usr/exim/configure
log selector = ffffffff
trusted user
admin user
originator: uid=0 gid=1 login=root name=Super-User
sender address = root@dev-smtp01
Address testing: uid=0 gid=60001 euid=0 egid=60001
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Testing tk@???
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Considering tk@???
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
routing tk@???
--------> dnslookup router <--------
local_part=tk domain=obitdot.com
checking domains
search_open: ldapm "NULL"
search_find: file="NULL"
key="ldap://192.168.10.84/dc=obitdot.com,o=top" partial=-1 affix=NULL
starflags=0
LRU list:
internal_search_find: file="NULL"
type=ldapm key="ldap://192.168.10.84/dc=obitdot.com,o=top"
database lookup required for ldap://192.168.10.84/dc=obitdot.com,o=top
LDAP parameters: user=NULL pass=NULL size=0 time=0 connect=-1
perform_ldap_search: ldapm URL
="ldap://192.168.10.84/dc=obitdot.com,o=top" server=NULL port=0
sizelimit=0 timelimit=0 tcplimit=-1
after ldap_url_parse: host=dc=obitdot.com,o=top port=0
initialized for LDAP (v3) server dc=obitdot.com,o=top:389
Segmentation Fault
[root@dev-smtp01 /var/log]#

Can someone please explain why I'm getting that seg fault at the end