Index: trunk/src/obj_pstk_proto.c
===================================================================
--- trunk/src/obj_pstk_proto.c	(revision 31564)
+++ trunk/src/obj_pstk_proto.c	(revision 31565)
@@ -1341,12 +1341,18 @@
 static undo_shape_geo_t *pstk_shape_geo_undo_init(pcb_pstk_proto_t *proto, int tridx, int shpidx)
 {
 	pcb_data_t *data = proto->parent;
+	pcb_board_t *pcb;
 	long pid;
 	undo_shape_geo_t *g;
 
-	if ((data == NULL) || (data->parent_type != PCB_PARENT_BOARD) || (!proto->in_use))
+	if (data == NULL)
 		return NULL;
 
+	pcb = pcb_data_get_top(data);
+
+	if ((pcb == NULL) || (!proto->in_use))
+		return NULL;
+
 	pid = proto - data->ps_protos.array;
 	if ((pid < 0) || (pid >= data->ps_protos.used))
 		return NULL;