diff --git a/src/models/club-member.spec.ts b/src/models/club-member.spec.ts
index 3cc552c..505624a 100644
--- a/src/models/club-member.spec.ts
+++ b/src/models/club-member.spec.ts
@@ -26,10 +26,15 @@ describe("ClubMember", () => {
 
   test("get dinnerPreferredDateTimeList", () => {
     // given
-    const member = generateMockClubMemberBy("lunch-dinner");
+    const a = generateMockClubMemberBy("lunch-dinner");
+    const b = generateMockClubMemberBy("lunch-dinner");
+
+    // when
+    b.dinnerPreferredDateTime = "";
 
     // then
-    expect(member.dinnerPreferredDateTimeList).toBeInstanceOf(Array);
+    expect(a.dinnerPreferredDateTimeList).toBeInstanceOf(Array);
+    expect(b.dinnerPreferredDateTimeList).toEqual([]);
   });
 
   test("isEligibleForLunch", () => {
diff --git a/src/models/club-member.ts b/src/models/club-member.ts
index 195e971..6b02e00 100644
--- a/src/models/club-member.ts
+++ b/src/models/club-member.ts
@@ -15,6 +15,10 @@ export default class ClubMember {
   ) {}
 
   get dinnerPreferredDateTimeList(): string[] {
+    if (!this.dinnerPreferredDateTime.trim()) {
+      return [];
+    }
+
     return this.dinnerPreferredDateTime.split(", ");
   }