diff --git a/mapero.php b/mapero.php
index f3894f7..8f31fc4 100644
--- a/mapero.php
+++ b/mapero.php
@@ -274,8 +274,9 @@ print $css_adicional;
 
 	<!-- <script src="librerias/jquery/jquery-2.1.4.min.js"></script> -->
 	<?php
+	if(isset($_REQUEST['buscar'])){
 	$cadena_busqueda = urlencode($_REQUEST['buscar']);
-
+}else{$cadena_busqueda="";}
 /*
 if (!copy($geojson_original, $nuevo_fichero)) {
     echo "Error al copiar $geojson_original ...\n";