diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index ccc1d11f703..25328ea0915 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2226,7 +2226,8 @@ CheckLDAPAuth(Port *port)
 		{
 			ereport(LOG,
 					(errmsg("could not perform initial LDAP bind for ldapbinddn \"%s\" on server \"%s\": %s",
-							port->hba->ldapbinddn, port->hba->ldapserver, ldap_err2string(r))));
+							port->hba->ldapbinddn ? port->hba->ldapbinddn : "",
+							port->hba->ldapserver, ldap_err2string(r))));
 			return STATUS_ERROR;
 		}
 
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index c634fa2b7fb..badd8e10593 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1471,9 +1471,11 @@ parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline, int line_num)
 			return false;
 		}
 
-		hbaline->ldapserver = pstrdup(urldata->lud_host);
+		if (urldata->lud_host)
+			hbaline->ldapserver = pstrdup(urldata->lud_host);
 		hbaline->ldapport = urldata->lud_port;
-		hbaline->ldapbasedn = pstrdup(urldata->lud_dn);
+		if (urldata->lud_dn)
+			hbaline->ldapbasedn = pstrdup(urldata->lud_dn);
 
 		if (urldata->lud_attrs)
 			hbaline->ldapsearchattribute = pstrdup(urldata->lud_attrs[0]);		/* only use first one */