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### Description using KEMI API in Python v2.7.18 for Kamailio v5.6.2, I encounter error in `ksr_onsend_route`, it always gives following error,

``` ERROR: app_python [python_support.c:154]: python_handle_exception(): apy_exec: ksr_onsend_route((null)): Unhandled exception in the Python code: TypeError: an integer is required ```

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

### Troubleshooting Above error happens even if there is no code in this function and it returns success, e.g.

``` python ... def ksr_onsend_route(self, msg): return 1

... ```

#### Reproduction It happens always whenever `ksr_onsend_route` function exists in `kamailio` class in KEMI python configuration for kamailio.

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#### Debugging Data Nothing relevant in debug even with `debug=9` set.

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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). -->

``` ERROR: app_python [python_support.c:154]: python_handle_exception(): apy_exec: ksr_onsend_route((null)): Unhandled exception in the Python code: TypeError: an integer is required ```

#### 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). -->

``` REGISTER sip:voip-test.sip-domain.de:5060 SIP/2.0. Via: SIP/2.0/UDP x.x.x.x:5060;branch=z9hG4bK-1523596-64-0. From: sip:490000063@voip-test.sip-domain.de:5060;tag=64. To: sip:490000063@voip-test.sip-domain.de:5060. Call-ID: call_id_64. CSeq: 1 REGISTER. Contact: sip:490000063@x.x.x.x:5060. Max-Forwards: 70. Content-Length: 0. ..

```

### Possible Solutions I suspect the problem is at low level (native code) of app_python module.

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### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.6.2 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: compiled with gcc 10.2.1 ```

``` Python 2.7.18 ```

* **Operating System**:

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``` Linux test-sip-server 5.10.0-17-amd64 #1 SMP Debian 5.10.136-1 (2022-08-13) x86_64 GNU/Linux ```