diff --git a/functions/src/market-close-emails.ts b/functions/src/market-close-emails.ts
index 83caca89..6b490e9d 100644
--- a/functions/src/market-close-emails.ts
+++ b/functions/src/market-close-emails.ts
@@ -26,6 +26,7 @@ async function sendMarketCloseEmails() {
         if (
           contract.resolution ||
           (contract.closeEmailsSent ?? 0) >= 1 ||
+          contract.closeTime === undefined ||
           (contract.closeTime ?? 0) > Date.now()
         )
           return undefined