diff --git a/frontend/src/api/queries/Market.ts b/frontend/src/api/queries/Market.ts
index 9bebc2d..8b791b9 100644
--- a/frontend/src/api/queries/Market.ts
+++ b/frontend/src/api/queries/Market.ts
@@ -74,7 +74,9 @@ const marketFromResponse = (response: ResponseMarket): Market => {
     withdrawalFee: BigNumber(response.withdrawal_fee),
     depositStopDate: new Nanoseconds(response.deposit_stop_date),
     withdrawalStopDate: new Nanoseconds(response.withdrawal_stop_date),
-    winnerOutcome: response.winner ? outcomes.find(outcome => outcome.id === `${response.winner}`) : undefined,
+    winnerOutcome: typeof response.winner === "number"
+      ? outcomes.find(outcome => outcome.id === `${response.winner}`)
+      : undefined,
     totalWallets: response.total_wallets,
     poolSize: BigNumber(response.pool_size),
   }