diff --git a/modules/member/member.admin.controller.php b/modules/member/member.admin.controller.php
index 0b88e7a8c..70202c1aa 100644
--- a/modules/member/member.admin.controller.php
+++ b/modules/member/member.admin.controller.php
@@ -976,6 +976,9 @@ class memberAdminController extends member
 
 		foreach($user_ids as $val)
 		{
+			$val = trim($val);
+			if(!$val) continue;
+
 			$output = $this->insertDeniedID($val, '');
 			if($output->toBool()) $success_ids[] = $val;
 		}
@@ -1014,6 +1017,9 @@ class memberAdminController extends member
 
 			foreach($nick_names as $val)
 			{
+				$val = trim($val);
+				if(!$val) continue;
+
 				$output = $this->insertDeniedNickName($val, '');
 				if($output->toBool()) $success_nick_names[] = $val;
 			}
@@ -1289,6 +1295,8 @@ class memberAdminController extends member
 	 */
 	function deleteDeniedID($user_id)
 	{
+		if(!$user_id) unset($user_id);
+
 		$args = new stdClass;
 		$args->user_id = $user_id;
 		return executeQuery('member.deleteDeniedID', $args);
@@ -1301,6 +1309,8 @@ class memberAdminController extends member
 	 */
 	function deleteDeniedNickName($nick_name)
 	{
+		if(!$nick_name) unset($nick_name);
+
 		$args = new stdClass;
 		$args->nick_name = $nick_name;
 		return executeQuery('member.deleteDeniedNickName', $args);