Index: stackup.c
===================================================================
--- stackup.c	(revision 29675)
+++ stackup.c	(revision 29676)
@@ -264,7 +264,7 @@
 			grp->ltype |= t->type;
 			grp->purpose = NULL;
 			if (t->purpose != NULL)
-				pcb_layergrp_set_purpose(grp, t->purpose);
+				pcb_layergrp_set_purpose(grp, t->purpose, 0);
 			return 0;
 		}
 	}