Index: layer_grp.h
===================================================================
--- layer_grp.h	(revision 9250)
+++ layer_grp.h	(revision 9251)
@@ -142,6 +142,8 @@
 #define PCB_COPPER_GROUP_LOOP(data, group) do { 	\
 	pcb_cardinal_t entry; \
 	pcb_board_t *cgl__pcb = pcb_data_get_top(data); \
+	if (cgl__pcb == NULL) \
+		cgl__pcb = PCB; \
         for (entry = 0; entry < ((pcb_board_t *)(cgl__pcb))->LayerGroups.grp[(group)].len; entry++) \
         { \
 		pcb_layer_t *layer;		\