From ae7cc20c6ce4abe79362799565807164212ee46a Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Sat, 12 Sep 2020 01:14:00 -0400
Subject: [PATCH] Keep track of checked values

---
 packages/next/lib/is-serializable-props.ts | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/next/lib/is-serializable-props.ts b/packages/next/lib/is-serializable-props.ts
index cb27279bf5c3b..f0122ba52fc67 100644
--- a/packages/next/lib/is-serializable-props.ts
+++ b/packages/next/lib/is-serializable-props.ts
@@ -98,11 +98,16 @@ export function isSerializableProps(
     if (Array.isArray(value)) {
       visit(refs, value, path)
 
+      const seen = new Set<any>()
       const newRefs = new Map(refs)
       if (
-        [...new Set(value)].every((nestedValue, index) =>
-          isSerializable(newRefs, nestedValue, `${path}[${index}]`)
-        )
+        value.every((nestedValue, index) => {
+          if (seen.has(nestedValue)) {
+            return true
+          }
+          seen.add(nestedValue)
+          return isSerializable(newRefs, nestedValue, `${path}[${index}]`)
+        })
       ) {
         return true
       }