Index: propdlg.c
===================================================================
--- propdlg.c	(revision 22071)
+++ propdlg.c	(revision 22072)
@@ -152,7 +152,7 @@
 	memset(&hv, 0, sizeof(hv));
 
 	switch(p->type) {
-		case PCB_PROPT_STRING: hv.str_value = pcb_strdup(pv->string); break;
+		case PCB_PROPT_STRING: hv.str_value = pcb_strdup(pv->string == NULL ? "" : pv->string); break;
 		case PCB_PROPT_COORD:  hv.coord_value = pv->coord; break;
 		case PCB_PROPT_ANGLE:  hv.real_value = pv->angle; break;
 		case PCB_PROPT_BOOL:
Index: propsel.c
===================================================================
--- propsel.c	(revision 22071)
+++ propsel.c	(revision 22072)
@@ -689,7 +689,7 @@
 char *pcb_propsel_printval(pcb_prop_type_t type, const pcb_propval_t *val)
 {
 	switch(type) {
-		case PCB_PROPT_STRING: return pcb_strdup(val->string);
+		case PCB_PROPT_STRING: return val->string == NULL ? pcb_strdup("") : pcb_strdup(val->string);
 		case PCB_PROPT_COORD:  return pcb_strdup_printf("%m+%.02mS", conf_core.editor.grid_unit->allow, val->coord);
 		case PCB_PROPT_ANGLE:  return pcb_strdup_printf("%f", val->angle);
 		case PCB_PROPT_INT:    return pcb_strdup_printf("%d", val->i);