Index: obj_subc_parent.h
===================================================================
--- obj_subc_parent.h	(revision 18339)
+++ obj_subc_parent.h	(revision 18340)
@@ -89,6 +89,7 @@
 		switch(obj->parent_type) {
 			case PCB_PARENT_INVALID: return pcb_false;
 			case PCB_PARENT_BOARD:   return pcb_false;
+			case PCB_PARENT_UI:      return pcb_false; /* shouldn't happen */
 			case PCB_PARENT_LAYER:   if (obj->parent.layer->parent.data == data) return pcb_true; break;
 			case PCB_PARENT_SUBC:    if (obj->parent.subc->data == data) return pcb_true; break;
 			case PCB_PARENT_DATA:    if (obj->parent.data == data) return pcb_true; break;