After the Kamailio code investigation found a request to the `active_watchers`
table related to “presence“ module. I think required this module update.
Related function
[get_subs_db](https://github.com/kamailio/kamailio/blob/16e6bfe4ed950851807c735cc3039046b77d6e6b/src/modules/presence/notify.c#L1200)
called from
[get_subs_dialog](https://github.com/kamailio/kamailio/blob/16e6bfe4ed950851807c735cc3039046b77d6e6b/src/modules/presence/notify.c#L1385).
According this code
```
if(pres_subs_dbmode == DB_ONLY) {
if(get_subs_db(pres_uri, event, sender, &s_array, &n) < 0) {
LM_ERR("getting dialogs from database\n");
goto error;
}
} else {
hash_code = core_case_hash(pres_uri, &event->name,
shtable_size);
lock_get(&subs_htable[hash_code].lock);
```
To avoid call `get_subs_db` required do not use `pres_subs_dbmode == DB_ONLY`.
We changed `subs_db_mode` to 2 and error message do not apper more.
```
modparam("presence", "subs_db_mode", 2)
```
In our use case database is used only by one Kamailio server and this approach
works for us.
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