Fix Router Error Events in Shallow Routing by Skipping cancelHandler Creation

packages/next/src/shared/lib/router/router.ts

@@ -1943,13 +1943,13 @@ export default class Router implements BaseRouter {
     let route = requestedRoute
 
     try {
-      const handleCancelled = getCancelledHandler({ route, router: this })
-
       let existingInfo: PrivateRouteInfo | undefined = this.components[route]
       if (routeProps.shallow && existingInfo && this.route === route) {
         return existingInfo
       }
 
+      const handleCancelled = getCancelledHandler({ route, router: this })
+
       if (hasMiddleware) {
         existingInfo = undefined
       }

test/development/pages-dir/client-navigation/fixture/pages/nav/query-only-shallow.js

@@ -0,0 +1,42 @@
+import Link from 'next/link'
+import { useRouter } from 'next/router'
+import { useEffect, useState } from 'react'
+
+export default function Page() {
+  const router = useRouter()
+
+  const [routeState, setRouteResult] = useState({
+    completed: 0,
+    errors: 0,
+  })
+  useEffect(() => {
+    const increaseErrorCount = () =>
+      setRouteResult((state) => ({ ...state, errors: state.errors + 1 }))
+    const increaseRouteComplete = () =>
+      setRouteResult((state) => ({ ...state, completed: state.completed + 1 }))
+    router.events.on('routeChangeError', increaseErrorCount)
+    router.events.on('routeChangeComplete', increaseRouteComplete)
+
+    return () => {
+      router.events.off('routeChangeError', increaseErrorCount)
+      router.events.off('routeChangeComplete', increaseRouteComplete)
+    }
+  })
+
+  return (
+    <>
+      <div id="routeState">{JSON.stringify(routeState)}</div>
+      <Link href="?prop=foo" id="link" shallow={true}>
+        Click me
+      </Link>
+      <button
+        id="router-replace"
+        onClick={() => {
+          router.replace('?prop=baz', undefined, { shallow: true })
+        }}
+      >
+        Push me
+      </button>
+    </>
+  )
+}

test/development/pages-dir/client-navigation/index.test.ts

@@ -1114,6 +1114,22 @@ createNextDescribe(
           await browser.close()
         }
       })
+
+      it('router.replace with shallow=true shall not throw route cancelled errors', async () => {
+        const browser = await webdriver(next.appPort, '/nav/query-only-shallow')
+        try {
+          await browser.elementByCss('#router-replace').click()
+          // the error occurs on every replace() after the first one
+          await browser.elementByCss('#router-replace').click()
+
+          await check(
+            () => browser.waitForElementByCss('#routeState').text(),
+            '{"completed":2,"errors":0}'
+          )
+        } finally {
+          await browser.close()
+        }
+      })
     })
 
     describe('with getInitialProp redirect', () => {