Index: trunk/src/obj_padstack_op.c
===================================================================
--- trunk/src/obj_padstack_op.c	(revision 12463)
+++ trunk/src/obj_padstack_op.c	(revision 12464)
@@ -140,7 +140,7 @@
 void *pcb_padstackop_change_thermal(pcb_opctx_t *ctx, pcb_padstack_t *ps)
 {
 	pcb_board_t *pcb = ctx->chgtherm.pcb;
-	pcb_layer_t *layer = pcb_get_layer(pcb, ctx->chgtherm.lid);
+	pcb_layer_t *layer = pcb_get_layer(pcb->Data, ctx->chgtherm.lid);
 	pcb_undo_add_obj_to_clear_poly(PCB_TYPE_PADSTACK, ps, ps, ps, pcb_false);
 	pcb_poly_restore_to_poly(pcb->Data, PCB_TYPE_PADSTACK, layer, ps);