diff --git a/_dev/js/theme/components/http/useDefaultHttpRequest.js b/_dev/js/theme/components/http/useDefaultHttpRequest.js
index 5f5c6184..130c8909 100644
--- a/_dev/js/theme/components/http/useDefaultHttpRequest.js
+++ b/_dev/js/theme/components/http/useDefaultHttpRequest.js
@@ -16,13 +16,7 @@ const useDefaultHttpRequest = (url, payload, options = {}) => {
       .query(payload)
       .post()
       .json((resp) => {
-        if (resp.errors) {
-          const errors = Array.isArray(resp.errors) ? resp.errors : [resp.errors];
-
-          reject(Error(errors.join('\n')));
-        } else {
-          resolve(resp);
-        }
+        resolve(resp);
       })
       .catch(() => {
         reject(Error(prestashop.t.alert.genericHttpError));
diff --git a/_dev/js/theme/core/cart/cartController.js b/_dev/js/theme/core/cart/cartController.js
index 5f59782e..3d58c5eb 100644
--- a/_dev/js/theme/core/cart/cartController.js
+++ b/_dev/js/theme/core/cart/cartController.js
@@ -8,6 +8,7 @@ import deleteFromCartHandler from './handler/cart/deleteFromCartHandler';
 import quantityChangeHandler from './handler/cart/quantityChangeHandler';
 import updateCartHandler from './handler/cart/updateCartHandler';
 import updatedCartHandler from './handler/cart/updatedCartHandler';
+import cartErrorsHandler from './handler/cart/cartErrorsHandler';
 import useCustomQuantityInput from '../../components/useCustomQuantityInput';
 
 const { on } = useEvent();
@@ -50,11 +51,14 @@ const cartController = () => {
     prestashop.on('updatedCart', (event) => {
       attachSpinnerEvents();
       updatedCartHandler(event);
+      cartErrorsHandler();
     });
 
     prestashop.on('updateCart', (event) => {
       updateCartHandler(event);
     });
+
+    cartErrorsHandler();
   };
 
   return {
diff --git a/_dev/js/theme/core/cart/handler/cart/cartErrorsHandler.js b/_dev/js/theme/core/cart/handler/cart/cartErrorsHandler.js
new file mode 100644
index 00000000..c179280c
--- /dev/null
+++ b/_dev/js/theme/core/cart/handler/cart/cartErrorsHandler.js
@@ -0,0 +1,61 @@
+import prestashop from 'prestashop';
+import cartStateStore from '../../store/cartStateStore';
+
+const {
+  setIsUpdateOperation,
+  setHasError,
+  setErrorMsg,
+  getErrorMsg,
+  getHasError,
+  getIsUpdateOperation,
+} = cartStateStore();
+
+/**
+ * Handles cart page errors
+ * Side effects: updates cart state and cart notification DOM
+ * @returns {void}
+ */
+const cartErrorsHandler = () => {
+  const checkoutBtn = document.querySelector(prestashop.selectors.checkout.btn);
+  const errorMsg = getErrorMsg();
+  const hasError = getHasError();
+  const isUpdateOperation = getIsUpdateOperation();
+  const notification = document.querySelector(prestashop.selectors.notifications.container);
+
+  if (document.querySelector(prestashop.selectors.notifications.dangerAlert) || (errorMsg !== '' && !hasError)) {
+    checkoutBtn.classList.add('disabled');
+  }
+
+  if (errorMsg !== '') {
+    const alertBlock = `
+        <article class="alert alert-danger" role="alert" data-alert="danger">
+          <ul class="mb-0">
+            <li>${errorMsg}</li>
+          </ul>
+        </article>
+      `;
+
+    if (notification) {
+      notification.innerHTML = alertBlock;
+    }
+
+    setErrorMsg('');
+    setIsUpdateOperation(false);
+
+    if (hasError) {
+      // if hasError is true, quantity was not updated : allow checkout
+      checkoutBtn.classList.remove('disabled');
+    }
+  } else if (!hasError && isUpdateOperation) {
+    setHasError(false);
+    setIsUpdateOperation(false);
+
+    if (notification) {
+      notification.innerHTML = '';
+    }
+
+    checkoutBtn.classList.remove('disabled');
+  }
+}
+
+export default cartErrorsHandler;
diff --git a/_dev/js/theme/core/cart/handler/cart/quantityChangeHandler.js b/_dev/js/theme/core/cart/handler/cart/quantityChangeHandler.js
index f03ccd90..67d62d88 100644
--- a/_dev/js/theme/core/cart/handler/cart/quantityChangeHandler.js
+++ b/_dev/js/theme/core/cart/handler/cart/quantityChangeHandler.js
@@ -1,9 +1,12 @@
 import prestashop from 'prestashop';
 import quantityChangeRequest from '../../request/cart/quantityChangeRequest';
 import useAlertToast from '../../../../components/useAlertToast';
+import cartStateStore from '../../store/cartStateStore';
 
 const { danger } = useAlertToast();
 
+const { setIsUpdateOperation, setHasError, setErrorMsg } = cartStateStore();
+
 /**
  * @param {string} operation - increase|decrease
  * @param {number} qtyDifference - quantity difference
@@ -31,6 +34,15 @@ const quantityChangeHandler = async (operation, qtyDifference, input) => {
   try {
     const resp = await getRequest();
 
+    const {
+      errors = '',
+      hasError = false,
+    } = resp;
+
+    setIsUpdateOperation(true);
+    setHasError(hasError);
+    setErrorMsg(errors);
+
     if (!resp.hasError) {
       prestashop.emit('updateCart', {
         reason: dataset || resp,
diff --git a/_dev/js/theme/core/cart/store/cartStateStore.js b/_dev/js/theme/core/cart/store/cartStateStore.js
new file mode 100644
index 00000000..2c50b96d
--- /dev/null
+++ b/_dev/js/theme/core/cart/store/cartStateStore.js
@@ -0,0 +1,78 @@
+const state = {
+  errorMsg: '',
+  isUpdateOperation: false,
+  hasError: false,
+};
+
+/**
+ * Store for cart state
+ * @module
+ * @returns {object}
+ */
+const cartStateStore = () => {
+
+  /**
+   * Sets the error message
+   * @method setErrorMsg
+   * @public
+   * @param {string} value
+   */
+  const setErrorMsg = (value) => {
+    state.errorMsg = value;
+  }
+
+  /**
+   * Returns the error message
+   * @method getErrorMsg
+   * @public
+   * @return {string}
+   */
+  const getErrorMsg = () => state.errorMsg;
+
+  /**
+   * Sets the isUpdateOperation value
+   * @method setIsUpdateOperation
+   * @public
+   * @param {boolean} value
+   */
+  const setIsUpdateOperation = (value) => {
+    state.isUpdateOperation = value;
+  }
+
+  /**
+   * Returns the isUpdateOperation value
+   * @method getIsUpdateOperation
+   * @public
+   * @return {boolean}
+   */
+  const getIsUpdateOperation = () => state.isUpdateOperation;
+
+  /**
+   * Sets the hasError value
+   * @method setHasError
+   * @public
+   * @param {boolean} value
+   */
+  const setHasError = (value) => {
+    state.hasError = value;
+  }
+
+  /**
+   * Returns the hasError value
+   * @method getHasError
+   * @public
+   * @return {boolean}
+   */
+  const getHasError = () => state.hasError;
+
+  return {
+    setErrorMsg,
+    getErrorMsg,
+    setIsUpdateOperation,
+    getIsUpdateOperation,
+    setHasError,
+    getHasError,
+  }
+}
+
+export default cartStateStore;
diff --git a/_dev/js/theme/core/product/productController.js b/_dev/js/theme/core/product/productController.js
index 4ea81aed..acd614c0 100644
--- a/_dev/js/theme/core/product/productController.js
+++ b/_dev/js/theme/core/product/productController.js
@@ -25,7 +25,19 @@ const persistFormDataOnInit = () => {
   }
 };
 
+/**
+ * Product controller
+ * @module productController
+ * @return {{init: init}}
+ */
 const productController = () => {
+
+  /**
+   * Init product controller
+   * @method init
+   * @public
+   * @return {void}
+   */
   const init = () => {
     persistFormDataOnInit();
     on(document, 'click', prestashop.selectors.listing.quickview, quickViewClickHandler);