diff --git a/tests/cypress/integration/actions_users/issue_2440_value_must_be_a_user_instance.js b/tests/cypress/integration/actions_users/issue_2440_value_must_be_a_user_instance.js
new file mode 100644
index 00000000..fbe424ed
--- /dev/null
+++ b/tests/cypress/integration/actions_users/issue_2440_value_must_be_a_user_instance.js
@@ -0,0 +1,45 @@
+// Copyright (C) 2020 Intel Corporation
+//
+// SPDX-License-Identifier: MIT
+
+/// <reference types="cypress" />
+
+import { taskName } from '../../support/const';
+
+context('Value must be a user instance.', () => {
+    const issueId = '2440';
+
+    before(() => {
+        cy.openTask(taskName);
+    });
+
+    describe(`Testing issue "${issueId}"`, () => {
+        it('Assign a task to a user', () => {
+            cy.get('.cvat-task-details-user-block').within(() => {
+                cy.get('.cvat-user-search-field').click();
+            });
+            cy.get('.ant-select-dropdown')
+                .not('.ant-select-dropdown-hidden')
+                .contains(new RegExp(`^${Cypress.env('user')}$`, 'g'))
+                .click();
+            cy.get('.cvat-spinner').should('exist');
+        });
+        it('Assign the task to the same user again', () => {
+            cy.get('.cvat-task-details-user-block').within(() => {
+                cy.get('.cvat-user-search-field').click();
+            });
+            cy.get('.ant-select-dropdown')
+                .not('.ant-select-dropdown-hidden')
+                .contains(new RegExp(`^${Cypress.env('user')}$`, 'g'))
+                .click();
+            // Before fix:
+            // The following error originated from your application code, not from Cypress.
+            // > Value must be a user instance
+            cy.get('.cvat-spinner').should('exist');
+            // Remove the user's assignment for next tests.
+            cy.get('.cvat-task-details-user-block').within(() => {
+                cy.get('[type="text"]').click().clear().type('{Enter}');
+            });
+        });
+    });
+});