diff --git a/src/static/js/ui/TableView.mjs b/src/static/js/ui/TableView.mjs
index 7fab691..cda9be0 100644
--- a/src/static/js/ui/TableView.mjs
+++ b/src/static/js/ui/TableView.mjs
@@ -3,6 +3,7 @@
 import Emel from 'emel';
 import fa_emel from './forkawesome_emel.mjs';
 
+import AbstractUIItem from './AbstractUIItem.mjs';
 import ui_item_index from './ui_item_index.mjs';
 import tabledefs from '../tabledefs/index.mjs';
 
@@ -43,7 +44,7 @@ class TableView {
 			el.classList.add("data-item");
 			el_dataitems.appendChild(el);
 			
-			if(typeof ui_item_index[def.type] !== "undefined") {
+			if(ui_item_index[def.type] instanceof AbstractUIItem) {
 				let item_manager = new ui_item_index[def.type](el, def);
 				this.el_parts.set(def.name, item_manager);
 			}