diff --git a/common/calculate.ts b/common/calculate.ts
index cc6451c5..06820edc 100644
--- a/common/calculate.ts
+++ b/common/calculate.ts
@@ -181,7 +181,7 @@ export function getContractBetNullMetrics() {
 export function getTopAnswer(contract: FreeResponseContract) {
   const { answers } = contract
   const top = _.maxBy(
-    answers.map((answer) => ({
+    answers?.map((answer) => ({
       answer,
       prob: getOutcomeProbability(contract, answer.id),
     })),