diff --git a/build.php b/build.php
index c78ebe0c..911188b7 100644
--- a/build.php
+++ b/build.php
@@ -37,6 +37,11 @@ if(isset($_GET['id'])) {
 	if (!ctype_digit(preg_replace("/[^a-zA-Z0-9_-]/","",$_GET['id']))){
 		$_GET['id'] = "1";
 	}
+	$checkBuildings = array(0,17,25,26,27);
+	if($_GET['id'] < 19 || !in_array($_GET['gid'], $checkBuildings)){
+	    $_GET['t'] = "";
+	    $_GET['s'] = "";
+	}
 	if($village->resarray['f'.$_GET['id'].'t'] == 17) {
 		$market->procRemove($_GET);
 	}