Index: layer_grp.h
===================================================================
--- layer_grp.h	(revision 8318)
+++ layer_grp.h	(revision 8319)
@@ -123,7 +123,7 @@
 		pcb_layer_t *layer;		\
 		pcb_layer_id_t number; 		\
 		number = ((pcb_board_t *)(data->pcb))->LayerGroups.grp[(group)].lid[entry]; \
-		if (!(pcb_layer_flags(number) & PCB_LYT_COPPER)) \
+		if (!(pcb_layer_flags(PCB, number) & PCB_LYT_COPPER)) \
 		  continue;			\
 		layer = &data->Layer[number];