Improvement for assertion following failed traversal

packages/driver/cypress/e2e/commands/assertions.cy.js

@@ -2072,6 +2072,20 @@ describe('src/cy/commands/assertions', () => {
 
         cy.wrap(undefined).should('have.value', 'somevalue')
       })
+
+      it('shows subject instead of undefined when a previous traversal errors', (done) => {
+        cy.on('log:added', (attrs, log) => {
+          if (attrs.name === 'assert') {
+            cy.removeAllListeners('log:added')
+            expect(log.get('message')).to.eq('expected **subject** to have class **updated**')
+            done()
+          }
+        })
+
+        cy.get('body')
+        .contains('Does not exist')
+        .should('have.class', 'updated')
+      })
     })
 
     context('descendants', () => {

packages/driver/src/cypress/chai_jquery.ts

@@ -67,7 +67,7 @@ export const $chaiJquery = (chai, chaiUtils, callbacks: Callbacks) => {
         // From jQuery 3.x .selector API is deprecated. (https://api.jquery.com/selector/)
         // Because of that, wrap() above removes selector property.
         // That's why we're caching the value of selector above and using it here.
-        ctx._obj = selector
+        ctx._obj = selector ?? 'subject'
         // if no element found, fail the existence check
         // depends on the negate flag
         ctx.assert(!!ctx.__flags.negate, ...args)