diff --git a/apps/web/src/session-logic.ts b/apps/web/src/session-logic.ts
index aa8f3ffc3..9c1f43dbf 100644
--- a/apps/web/src/session-logic.ts
+++ b/apps/web/src/session-logic.ts
@@ -373,7 +373,7 @@ export function findLatestProposedPlan(
       .filter((proposedPlan) => proposedPlan.turnId === latestTurnId)
       .toSorted(
         (left, right) =>
-          left.updatedAt.localeCompare(right.updatedAt) || left.id.localeCompare(right.id),
+          left.updatedAt.localeCompare(right.updatedAt) ?? left.id.localeCompare(right.id),
       )
       .at(-1);
     if (matchingTurnPlan) {
@@ -390,7 +390,7 @@ export function findLatestProposedPlan(
   const latestPlan = [...proposedPlans]
     .toSorted(
       (left, right) =>
-        left.updatedAt.localeCompare(right.updatedAt) || left.id.localeCompare(right.id),
+        left.updatedAt.localeCompare(right.updatedAt) ?? left.id.localeCompare(right.id),
     )
     .at(-1);
   if (!latestPlan) {