diff --git a/js/script_Luk_Q.js b/js/script_Luk_Q.js
index 0e91ddb..261d8fe 100644
--- a/js/script_Luk_Q.js
+++ b/js/script_Luk_Q.js
@@ -363,6 +363,12 @@ $(document).ready(function() {
 	// Evento: Submit form
 	$("form").submit(function(e){
 		e.preventDefault();
+		var qText = $("form #queryText")[0].value;
+		var tabsC=$("#cla-TabContent").find(".tab-pane:not(:first)");
+		if (qText == "" && $(tabsC).length == 0) {
+			alert("Inserire un termine di ricerca od una clausola!");
+			return false;
+		}
   		//alert("Funzione non ancora implementata!");
 		//const SparqlParser = sparqljs.Parser;
   		const sparqlGenerator = sparqljs.Generator;