diff --git a/src/exporters/stat.ink.ts b/src/exporters/stat.ink.ts
index 45e6656..86b3d00 100644
--- a/src/exporters/stat.ink.ts
+++ b/src/exporters/stat.ink.ts
@@ -263,7 +263,7 @@ export class StatInkExporter implements GameExporter {
     }
     result.our_team_count = myTeam?.result?.score ?? undefined;
     result.their_team_count = otherTeams?.[0]?.result?.score ?? undefined;
-    result.rank_exp_change = bankaraMatch?.earnedUdemaePoint;
+    result.rank_exp_change = bankaraMatch?.earnedUdemaePoint ?? undefined;
     if (listNode) {
       [result.rank_before, result.rank_before_s_plus] = parseUdemae(
         listNode.udemae,
diff --git a/src/types.ts b/src/types.ts
index 236cddf..d1a72d4 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -138,7 +138,7 @@ export type VsHistoryDetail = {
   playedTime: string; // 2021-01-01T00:00:00Z
 
   bankaraMatch: {
-    earnedUdemaePoint: number;
+    earnedUdemaePoint: null | number;
     mode: "OPEN" | "CHALLENGE";
   } | null;
   festMatch: {