Index: trunk/src/layer.c
===================================================================
--- trunk/src/layer.c	(revision 19308)
+++ trunk/src/layer.c	(revision 19309)
@@ -952,7 +952,10 @@
 	lay->is_bound = 1;
 	lay->name = pcb_strdup(name);
 	lay->meta.bound.type = type;
-	lay->meta.bound.purpose = purpose;
+	if (purpose == NULL)
+		lay->meta.bound.purpose = NULL;
+	else
+		lay->meta.bound.purpose = pcb_strdup(purpose);
 	lay->parent.data = data;
 	lay->parent_type = PCB_PARENT_DATA;
 	lay->type = PCB_OBJ_LAYER;