There seems to be an incompatibility in the pua_json module related to the libjson-c-dev" version. The module crashes on startup on version 0.15.2 (e.g. from Debian bullseye).

It works with version 0.12 (e.g. Debian buster).

Backtrace below: ``` #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 #1 0x00007f6d265e5537 in __GI_abort () at abort.c:79 #2 0x00007f6d265e540f in __assert_fail_base (fmt=0x7f6d2675d6a8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f6d2322c091 "jso->_ref_count > 0", file=0x7f6d2322c064 "./json_object.c", line=308, function=<optimized out>) at assert.c:92 #3 0x00007f6d265f4662 in __GI___assert_fail (assertion=0x7f6d2322c091 "jso->_ref_count > 0", file=0x7f6d2322c064 "./json_object.c", line=308, function=0x7f6d2322c480 "json_object_put") at assert.c:101 #4 0x00007f6d23224732 in json_object_put () from /lib/x86_64-linux-gnu/libjson-c.so.5 #5 0x00007f6d25842362 in pua_json_publish (msg=0x7fffb3fffb20, json=0x7f6d25ff5778 "{"Call-ID":"111","Event-Category":"presence","Event-Name":"update","Event-Package":"message-summary","Expires":"3600","To":"sip:103@XXX.YYY.55.208","To-User":"103","To-Realm":"XXX.YYY.55.208","From":""...) at pua_json_publish.c:383 #6 0x00007f6d2583e74a in w_pua_json_publish (msg=0x7fffb3fffb20, p1pjson=0x7f6d25ff5988 "xW\377%m\177", p2=0x0) at pua_json_mod.c:100 #7 0x0000563199d1c47e in do_action () #8 0x0000563199d29ae6 in run_actions () #9 0x00007f6d2324444e in ?? () from /usr/lib/x86_64-linux-gnu/kamailio/modules/xhttp.so #10 0x00007f6d23246005 in ?? () from /usr/lib/x86_64-linux-gnu/kamailio/modules/xhttp.so #11 0x0000563199e6cb10 in nonsip_msg_run_hooks () #12 0x0000563199ede538 in receive_msg () #13 0x0000563199cac4f2 in receive_tcp_msg () #14 0x0000563199caeb51 in tcp_read_req () #15 0x0000563199cb2028 in ?? () #16 0x0000563199c9da4f in ?? () #17 0x0000563199cb4f8c in tcp_receive_loop () #18 0x0000563199e2330b in tcp_init_children () #19 0x0000563199c8967f in main_loop () #20 0x0000563199c9446e in main () ```