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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. -->

After upgrading kamailio from 5.4.4 to 5.4.5, the lcr module logs an error for outgoing calls. load_gws returns success (1), but does not populate the avps. Consequently, next_gw fails.

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. --> kamailio.cfg:

``` loadmodule "lcr.so"

...

modparam("lcr", "db_url", "cluster://cls1") modparam("lcr", "gw_uri_avp", "$avp(i:709)") modparam("lcr", "ruri_user_avp", "$avp(i:500)") modparam("lcr", "tag_avp", "$avp(lcr_tag)") modparam("lcr", "flags_avp", "$avp(i:712)") modparam("lcr", "defunct_capability", 1) modparam("lcr", "lcr_id_avp", "$avp(s:lcr_id_avp)") modparam("lcr", "defunct_gw_avp", "$avp(s:defunct_gw_avp)") modparam("lcr", "ping_interval", 60)

...

route[LCR] { if(!($rU=~"^[+0-9]")) return;

if(is_method("INVITE")) { if (!($fU=~"^[+0-9]+$")) { append_hf("P-Asserted-Identity: sip:+49xxxxxxxxxxx@xxxxx.de\n"); append_hf("Privacy: id\n"); $fn = "Anonymous"; $fu = "sip:+49xxxxxxxxxxx@xxxxx.de"; }

if(load_gws(1, $rU, $var(caller_uri)) != 1) { xlog("L_ERROR", "Couldn't load gateways\n"); sl_send_reply("500", "Server Internal Error - Cannot load gateways"); exit; } else { xlog("L_INFO", "GW Selected '$avp(i:709)'\n"); xlog("L_INFO", "Domain of destination: $dd\n"); xlog("L_INFO", "To URI: $tu\n"); }

if(!next_gw()) { xlog("L_WARN", "No gateway configured for $rU\n"); sl_send_reply("503", "Service not available, no gateways found"); exit; } else { xlog("L_INFO", "Calling the first matched gateway\n"); xlog("L_INFO", "ruri_user_avp: '$avp(i:500)'\n"); xlog("L_INFO", "To URI after next_gw: $tu\n"); xlog("L_INFO", "Request URI: $ru\n"); }

t_on_failure("MANAGE_FAILURE_LCR"); route(RELAY); exit; } } ```

#### Debugging Data

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gdb /path/to/kamailio /path/to/corefile bt full info locals list

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#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` Apr 15 20:59:27 x /usr/sbin/kamailio[879]: ERROR: <core> [core/usr_avp.c:152]: create_avp(): 0 ID or NULL NAME AVP! Apr 15 20:59:27 x /usr/sbin/kamailio[879]: ERROR: <core> [core/usr_avp.c:152]: create_avp(): 0 ID or NULL NAME AVP! Apr 15 20:59:27 x /usr/sbin/kamailio[879]: INFO: <script>: GW Selected '<null>' Apr 15 20:59:27 x /usr/sbin/kamailio[879]: INFO: <script>: Domain of destination: <null> Apr 15 20:59:27 x /usr/sbin/kamailio[879]: INFO: <script>: To URI: sip:+49177xxxxxxx@xx.xxx.x.xxx:5060 Apr 15 20:59:27 x /usr/sbin/kamailio[879]: WARNING: <script>: No gateway configured for +49177xxxxxxx ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

SIP request: ``` INVITE sip:+49177xxxxxxx@xx.xx.xx.xxx:5060 SIP/2.0 Via: SIP/2.0/UDP xxx.xx.xx.xxx:xxxxx;branch=z9hG4bK5d833a50 Max-Forwards: 70 From: sip:+xxxxxxxxxxx@xxx.xx.xx.xxx:xxxxx;tag=as18ff0d47 To: sip:+49177xxxxxxx@xx.xx.xx.xxx:5060 Contact: sip:+xxxxxxxxxxx@xxx.xx.xx.xxx:xxxxx Call-ID: 7489c50703b43b2f03980574181a2f81@xxx.xx.xx.xxx:xxxxx CSeq: 102 INVITE User-Agent: Asterisk PBX 13.18.3~dfsg-1ubuntu4 Date: Thu, 15 Apr 2021 21:52:42 GMT Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE Supported: replaces, timer Content-Type: application/sdp Content-Length: 952

... ```

SIP reply: ``` SIP/2.0 503 Service not available, no gateways found Via: SIP/2.0/UDP xxx.xx.xx.xxx:xxxxx;branch=z9hG4bK5d833a50;rport=50060;received=xx.xx.xx.xxx From: sip:+xxxxxxxxxxx@xxx.xx.xx.xxx:xxxxx;tag=as18ff0d47 To: sip:+49177xxxxxxx@xx.xx.xx.xxx:5060;tag=6a823999ce344a0b461cf8d85d526103.51611a36 Call-ID: 7489c50703b43b2f03980574181a2f81@xxx.xx.xx.xxx:xxxxx CSeq: 102 INVITE Server: kamailio (5.4.5 (x86_64/linux)) Content-Length: 0 ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->

As a workaround, I downgraded to kamailio 5.3.8 because the previous Ubuntu release 5.4.4 is not available anymore at http://deb.kamailio.org/kamailio54/pool/main/k/kamailio/ (why actually?)

### Additional Information

* **Kamailio Version** 5.4.5 * **Operating System**: Ubuntu 18.04

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

### Root Cause Assumption

https://github.com/kamailio/kamailio/commit/ca1821837dfe7dd6630f628d968ed4d1... might be involved in the issue.