### Description

Kamailio started to crash in 5.0.5 in http_async_client module. Works in 5.0.4

### Troubleshooting

#### Reproduction

Use http_async_client.

#### Debugging Data

Not yet extracted. Need to figure out how to access the core because it is a container.

#### Log Messages

``` 4(30) : <core> [core/mem/q_malloc.c:483]: qm_free(): BUG: qm_free: freeing already freed pointer (0x7fccc205d368), called from http_async_client: async_http.c: set_query_params(599), first free http_async_client: async_http.c: set_query_params(599) - aborting 51(77) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 35 0(1) ALERT: <core> [main.c:742]: handle_sigs(): child process 30 exited by a signal 6 0(1) ALERT: <core> [main.c:745]: handle_sigs(): core was generated 0(1) INFO: <core> [main.c:768]: handle_sigs(): terminating due to SIGCHLD ```

#### SIP Traffic

### Possible Solutions

### Additional Information

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

``` version: kamailio 5.0.5 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 5.3.1 ```

* **Operating System**:

``` Ubuntu 16.04 (Xenial) ```