diff --git a/inertia-sails/private/inertia-middleware.js b/inertia-sails/private/inertia-middleware.js
index a48d0e04..17e48b28 100644
--- a/inertia-sails/private/inertia-middleware.js
+++ b/inertia-sails/private/inertia-middleware.js
@@ -11,27 +11,29 @@ const getPartialData = require('./get-partial-data')
 const resolveValidationErrors = require('./resolve-validation-errors')
 function inertia(sails, { hook, sharedProps, sharedViewData, rootView }) {
   return function inertiaMiddleware(req, res, next) {
-    /**
-     * Flash messages stored in the session.
-     * @typedef {Object} FlashMessages
-     * @property {Array} message - Flash message(s).
-     * @property {Array} error - Error message(s).
-     * @property {Array} success - Success message(s).
-     */
-    const flash = {
-      message: req.flash('message'),
-      error: req.flash('error'),
-      success: req.flash('success')
-    }
-    hook.share('flash', flash) // Share the flash object as props
-    /**
-     * Validation errors stored in the session, resolved and formatted for Inertia.js.
-     * @type {Object}
-     */
-    const validationErrors = resolveValidationErrors(req)
-    req.flash('errors', validationErrors) // Flash the validation error so we can share it later
+    if (isInertiaRequest(req)) {
+      /**
+       * Flash messages stored in the session.
+       * @typedef {Object} FlashMessages
+       * @property {Array} message - Flash message(s).
+       * @property {Array} error - Error message(s).
+       * @property {Array} success - Success message(s).
+       */
+      const flash = {
+        message: req.flash('message'),
+        error: req.flash('error'),
+        success: req.flash('success')
+      }
+      hook.share('flash', flash) // Share the flash object as props
+      /**
+       * Validation errors stored in the session, resolved and formatted for Inertia.js.
+       * @type {Object}
+       */
+      const validationErrors = resolveValidationErrors(req)
+      req.flash('errors', validationErrors) // Flash the validation error so we can share it later
 
-    hook.share('errors', req.flash('errors')[0] || {}) // Share validation errors as props
+      hook.share('errors', req.flash('errors')[0] || {}) // Share validation errors as props
+    }
 
     hook.render = function (component, props = {}, viewData = {}) {
       const allProps = {