Description of problem:
Program received signal SIGSEGV, Segmentation fault.
ldap_set_option (ld=ld@entry=0xffffffffec809c70, option=option@entry=17, invalue=invalue@entry=0x7fff84895e3c) at options.c:450
450                     assert( LDAP_VALID( ld ) );
(gdb) where
#0  ldap_set_option (ld=ld@entry=0xffffffffec809c70, option=option@entry=17, invalue=invalue@entry=0x7fff84895e3c) at options.c:450
#1  0x00007fc5eab92059 in sgDoLdapSearch (
    url=0x7fc5ec56e1d0 "ldap://ldap.example.com/cn=brian,ou=Group,dc=interlinx,dc=bc,dc=ca?memberUid?sub?(&(objectclass=posixGroup)(memberUid=%s))", 
    username=username@entry=0x7fff848b1054 "brian") at sg.y:2721
#2  0x00007fc5eab924f5 in sgFindUser (src=src@entry=0x7fc5ec56e110, ident=ident@entry=0x7fff848b1054 "brian", rval=rval@entry=0x7fff84898f00) at sg.y:2569
#3  0x00007fc5eab92757 in sgFindSource (bsrc=bsrc@entry=0x7fc5ec56e110, net=net@entry=0x7fff848ba060 "fd31:aeb1:48df:0:feaa:14ff:fe6c:51ab", 
    ident=ident@entry=0x7fff848b1054 "brian", domain=domain@entry=0x7fff848ae054 "") at sg.y:1030
#4  0x00007fc5eab89646 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at main.c:195


Version-Release number of selected component (if applicable):
squidGuard-1.4-20.el7.1.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Install squid and squidGuard
2. Configure squidGuard to use LDAP lookup for users
3. Fetch a URL

Actual results:
squidGuard segfaults

Expected results:
squidGuard should not segfault

Additional info:
LDAP configuration in squidGuard.conf:

ldapprotover    3

src brian {
        ldapusersearch  ldap://ldap.example.com/cn=brian,ou=Group,dc=example,dc=com?memberUid?sub?(&(objectclass=posixGroup)(memberUid=%s))
}
...
brian { 
                pass whitelist !advertising all
                # redirect in the dest
        }