Those patches were suppose to protect against a memcpy from a null pointer, which can be problematic on some systems:
- [lost PV functions: runtime error: null pointer passed as argument 2, which is declared to never be null #2913](https://github.com/kamailio/kamailio/issues/2913)
Is this happening only when assigning `$aa`, or happens for any assignment done to `$var(...)`?
Tested with pv $ai and $dd and result is the same: **scscf kamailio.cfg code:** 713 xlog("ai [$ai]\n"); 714 $var(var_ai) = $ai; 715 xlog("var_ai [$var(var_ai)] len=$(var(var_ia){s.len})\n"); 716 717 xlog("dd [$dd]\n"); 718 $var(var_dd) = $dd; 719 xlog("var_dd [$var(var_dd)] len=$(var(var_dd){s.len})\n");
**Log output:** 19572 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=713 a=25 n=xlog 19573 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) DEBUG: pv [pv_core.c:1327]: pv_get_pai(): no P-Asserted-Identity header 19574 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: <script>: **ai [<null>]** 19575 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=714 a=63 n=assign 19576 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) DEBUG: pv [pv_core.c:1327]: pv_get_pai(): no P-Asserted-Identity header 19577 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=715 a=25 n=xlog 19578 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: <script>: **var_ai [0] len=1** 19579 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=717 a=25 n=xlog 19580 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) DEBUG: pv [pv_core.c:1443]: pv_get_dsturi_attr(): no destination URI 19581 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: <script>: **dd [<null>]** 19582 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=718 a=63 n=assign 19583 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) DEBUG: pv [pv_core.c:1443]: pv_get_dsturi_attr(): no destination URI 19584 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=719 a=25 n=xlog 19585 Nov 12 13:30:43 ims_dev-107 kamailio_scscf[4439]: 1(4472) ERROR: <script>: **var_dd [0] len=1**