diff --git a/lib/CleantalkSP/SpbctWP/Firewall/FirewallModule.php b/lib/CleantalkSP/SpbctWP/Firewall/FirewallModule.php
index 0346c582d..d501205d9 100644
--- a/lib/CleantalkSP/SpbctWP/Firewall/FirewallModule.php
+++ b/lib/CleantalkSP/SpbctWP/Firewall/FirewallModule.php
@@ -148,7 +148,7 @@ public function _die(Result $result) // phpcs:ignore PSR2.Methods.MethodDeclarat
 
             // Check if this is test mode
             $is_test_mode = (bool) Get::getString('spbct_test');
-            $test_ip = Get::getString('spbct_test_ip');
+            $test_ip = esc_html(Get::getString('spbct_test_ip'));
 
             // Translation
             $replaces = array(