diff --git a/web/lib/firebase/bets.ts b/web/lib/firebase/bets.ts
index 287a98a2..982d4f89 100644
--- a/web/lib/firebase/bets.ts
+++ b/web/lib/firebase/bets.ts
@@ -52,10 +52,11 @@ export function listenForUserBets(
   })
 }
 
-export function withoutAnteBets(contract: Contract, bets: Bet[]) {
+export function withoutAnteBets(contract: Contract, bets?: Bet[]) {
   const { createdTime } = contract
 
   if (
+    bets &&
     bets.length >= 2 &&
     bets[0].createdTime === createdTime &&
     bets[1].createdTime === createdTime
@@ -63,5 +64,5 @@ export function withoutAnteBets(contract: Contract, bets: Bet[]) {
     return bets.slice(2)
   }
 
-  return bets
+  return bets ?? []
 }
diff --git a/web/pages/activity.tsx b/web/pages/activity.tsx
index 359990dd..319dde6c 100644
--- a/web/pages/activity.tsx
+++ b/web/pages/activity.tsx
@@ -77,7 +77,7 @@ export function ActivityFeed(props: {
             <div key={contract.id} className="py-6 px-2 sm:px-4">
               <ContractFeed
                 contract={contract}
-                bets={contractBets[i]}
+                bets={contractBets[i] ?? []}
                 comments={contractComments[i]}
                 feedType="activity"
               />