update

modules/eicaptcha/override/controllers/front/OrderController.php

@@ -0,0 +1,18 @@
+<?php
+
+class OrderController extends OrderControllerCore
+{
+    public function postProcess()
+    {
+        if (
+            Tools::isSubmit('submitCreate')
+            && Module::isInstalled('eicaptcha')
+            && Module::isEnabled('eicaptcha')
+            && false === Module::getInstanceByName('eicaptcha')->hookActionCustomerRegisterSubmitCaptcha([])
+            && !empty($this->errors)
+        ) {
+            unset($_POST['submitCreate']);
+        }
+        parent::postProcess();
+    }
+}