Tested with pv $du too. Even if explicitly set to null pv $du the result is the same.
``` 721 xlog("du [$du]\n"); 722 $var(var_du) = $du; 723 xlog("var_du [$var(var_du)] len=$(var(var_du){s.len})\n"); 724 $du=$null; 725 xlog("du1 [$du]\n"); 726 $var(var_du1) = $du; 727 xlog("var_du1 [$var(var_du1)] len=$(var(var_du1){s.len})\n"); ```
Log output: 36084 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=721 a=25 n=xlog 36085 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv [pv_core.c:1427]: pv_get_dsturi(): no destination URI 36086 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>: **du [<null>]** 36087 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=722 a=63 n=assign 36088 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv [pv_core.c:1427]: pv_get_dsturi(): no destination URI 36089 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=723 a=25 n=xlog 36090 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>: **var_du [0] len=1** 36091 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=724 a=63 n=assign 36092 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=725 a=25 n=xlog 36093 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv [pv_core.c:1427]: pv_get_dsturi(): no destination URI 36094 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>: **du1 [<null>]** 36095 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=726 a=63 n=assign 36096 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv [pv_core.c:1427]: pv_get_dsturi(): no destination URI 36097 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=727 a=25 n=xlog 36098 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>: **var_du1 [0] len=1**