diff --git a/upload/uc_server/install/func.inc.php b/upload/uc_server/install/func.inc.php
index 4456056ea343107cdd7b9866e6633a40a5aa5703..476a80476d21dea3fd9d32c17fe297b0bb32772c 100644
--- a/upload/uc_server/install/func.inc.php
+++ b/upload/uc_server/install/func.inc.php
@@ -635,7 +635,7 @@ function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
 function generate_key() {
 	$random = random(32);
 	$info = md5($_SERVER['SERVER_SOFTWARE'].$_SERVER['SERVER_NAME'].$_SERVER['SERVER_ADDR'].$_SERVER['SERVER_PORT'].$_SERVER['HTTP_USER_AGENT'].time());
-	$return = '';
+	$return = array();
 	for($i=0; $i<64; $i++) {
 		$p = intval($i/2);
 		$return[$i] = $i % 2 ? $random[$p] : $info[$p];
diff --git a/upload/uc_server/upgrade/upgrade2.php b/upload/uc_server/upgrade/upgrade2.php
index 3a11f88202fab4c15a8fb0e9579433e5049b5216..360efe6d25e99848b64b6f0dcb7babaa376839d9 100644
--- a/upload/uc_server/upgrade/upgrade2.php
+++ b/upload/uc_server/upgrade/upgrade2.php
@@ -268,7 +268,7 @@ function random($length, $numeric = 0) {
 function generate_key() {
 	$random = random(32);
 	$info = md5($_SERVER['SERVER_SOFTWARE'].$_SERVER['SERVER_NAME'].$_SERVER['SERVER_ADDR'].$_SERVER['SERVER_PORT'].$_SERVER['HTTP_USER_AGENT'].time());
-	$return = '';
+	$return = array();
 	for($i=0; $i<64; $i++) {
 		$p = intval($i/2);
 		$return[$i] = $i % 2 ? $random[$p] : $info[$p];
diff --git a/upload/uc_server/upgrade/upgrade3.php b/upload/uc_server/upgrade/upgrade3.php
index 4b73ac4f10de583d1c3a7641dc2f9076bb4c6a68..f7415e05449f74ec3cff5b1354f569d4bbfc562b 100644
--- a/upload/uc_server/upgrade/upgrade3.php
+++ b/upload/uc_server/upgrade/upgrade3.php
@@ -474,7 +474,7 @@ function random($length, $numeric = 0) {
 function generate_key() {
 	$random = random(32);
 	$info = md5($_SERVER['SERVER_SOFTWARE'].$_SERVER['SERVER_NAME'].$_SERVER['SERVER_ADDR'].$_SERVER['SERVER_PORT'].$_SERVER['HTTP_USER_AGENT'].time());
-	$return = '';
+	$return = array();
 	for($i=0; $i<64; $i++) {
 		$p = intval($i/2);
 		$return[$i] = $i % 2 ? $random[$p] : $info[$p];