Index: scad_draw.c
===================================================================
--- scad_draw.c	(revision 14410)
+++ scad_draw.c	(revision 14411)
@@ -118,6 +118,11 @@
 {
 	pcb_pstk_proto_t *proto = pcb_pstk_get_proto(ps);
 
+	if (proto == NULL) {
+		pcb_io_incompat_save(ps->parent.data, (pcb_any_obj_t *)ps, "failed to retrieve padstack prototype", "internal pcb-rnd error, please file a bugreport");
+		return;
+	}
+
 #warning padstack TODO: this ignores bbvias
 	if (proto->hdia > 0) {
 		pcb_fprintf(f, "	translate([%mm,%mm,0])\n", TRX_(ps->x), TRY_(ps->y));
Index: scad_models.c
===================================================================
--- scad_models.c	(revision 14410)
+++ scad_models.c	(revision 14411)
@@ -124,8 +124,10 @@
 			double rot = 0;
 			int on_bottom = 0;
 			
-			if (pcb_subc_get_origin(subc, &ox, &oy) != 0)
+			if (pcb_subc_get_origin(subc, &ox, &oy) != 0) {
+				pcb_io_incompat_save(PCB->Data, (pcb_any_obj_t *)subc, "Failed to get origin of subcircuit", "fix the missing subc-aux layer");
 				continue;
+			}
 			pcb_subc_get_rotation(subc, &rot);
 			pcb_subc_get_side(subc, &on_bottom);