diff --git a/functions/src/resolve-market.ts b/functions/src/resolve-market.ts
index 6fe9e46d..5a2edec2 100644
--- a/functions/src/resolve-market.ts
+++ b/functions/src/resolve-market.ts
@@ -174,7 +174,7 @@ const sendResolutionEmails = async (
     ...nonWinners.map((userId) => [userId, 0] as const),
   ].map(([userId, payout]) => ({
     userId,
-    investment: investedByUser[userId],
+    investment: investedByUser[userId] ?? 0,
     payout,
   }))