Remove unused error (vercel#15748)

Irrelevant since vercel#15379
matt416 · Jul 31, 2020 · ad5c736 · ad5c736
1 parent b3c9737
commit ad5c736
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diff --git a/errors/popstate-state-empty.md b/errors/popstate-state-empty.md
@@ -2,12 +2,12 @@
 
 #### Why This Error Occurred
 
-When using the browser back button the popstate event is triggered. Next.js sets
-`popstate` event triggered but `event.state` did not have `url` or `as`, causing a route change failure
+When using the browser back button the popstate event is triggered. Next.js sees a
+`popstate` event being triggered but `event.state` did not have `url` or `as`, causing a route change failure.
 
 #### Possible Ways to Fix It
 
-The only known cause of this issue is manually manipulating `window.history` instead of using `next/router`
+The only known cause of this issue is manually manipulating `window.history` instead of using `next/router`. Starting from version 9.5, Next.js will ignore `popstate` events that contain `event.state` not created by its own router.
 
 ### Useful Links
 

diff --git a/packages/next/next-server/lib/router/router.ts b/packages/next/next-server/lib/router/router.ts
@@ -360,13 +360,6 @@ export default class Router implements BaseRouter {
       return
     }
 
-    if (process.env.NODE_ENV !== 'production') {
-      if (typeof url === 'undefined' || typeof as === 'undefined') {
-        console.warn(
-          '`popstate` event triggered but `event.state` did not have `url` or `as` https://err.sh/vercel/next.js/popstate-state-empty'
-        )
-      }
-    }
     this.change('replaceState', url, as, options)
   }