diff --git a/src/main/java/com/moabam/api/application/NotificationService.java b/src/main/java/com/moabam/api/application/NotificationService.java
index 36d30a67..4454d896 100644
--- a/src/main/java/com/moabam/api/application/NotificationService.java
+++ b/src/main/java/com/moabam/api/application/NotificationService.java
@@ -44,9 +44,9 @@ public void sendKnockNotification(MemberTest member, Long targetId, Long roomId)
 		notificationRepository.saveKnockNotification(knockKey);
 	}
 
-	@Scheduled(cron = CRON_CERTIFY_TIME_EXPRESSION)
+	@Scheduled(cron = "0 50 * * * *")
 	public void sendCertificationTimeNotification() {
-		int certificationTime = (LocalDateTime.now().getHour() + ONE) % HOURS_IN_A_DAY;
+		int certificationTime = (LocalDateTime.now().getHour() + ONE_HOUR) % HOURS_IN_A_DAY;
 		List<Participant> participants = participantSearchRepository.findAllByRoomCertifyTime(certificationTime);
 
 		participants.parallelStream().forEach(participant -> {
@@ -58,9 +58,11 @@ public void sendCertificationTimeNotification() {
 
 	private void sendAsyncFcm(Long fcmTokenKey, Notification notification) {
 		String fcmToken = notificationRepository.findFcmTokenByMemberId(fcmTokenKey);
-		Message message = NotificationMapper.toMessageEntity(notification, fcmToken);
 
-		firebaseMessaging.sendAsync(message);
+		if (fcmToken != null) {
+			Message message = NotificationMapper.toMessageEntity(notification, fcmToken);
+			firebaseMessaging.sendAsync(message);
+		}
 	}
 
 	private void validateConflictKnockNotification(String knockKey) {
diff --git a/src/main/java/com/moabam/global/common/constant/GlobalConstant.java b/src/main/java/com/moabam/global/common/constant/GlobalConstant.java
index 9818b4ca..a3cafbd3 100644
--- a/src/main/java/com/moabam/global/common/constant/GlobalConstant.java
+++ b/src/main/java/com/moabam/global/common/constant/GlobalConstant.java
@@ -8,9 +8,8 @@ public class GlobalConstant {
 
 	public static final String BLANK = "";
 	public static final String COMMA = ",";
-	public static final String UNDER_BAR = "_";
 	public static final String CHARSET_UTF_8 = ";charset=UTF-8";
 	public static final String SPACE = " ";
-	public static final int ONE = 1;
+	public static final int ONE_HOUR = 1;
 	public static final int HOURS_IN_A_DAY = 24;
 }
diff --git a/src/test/java/com/moabam/api/application/NotificationServiceTest.java b/src/test/java/com/moabam/api/application/NotificationServiceTest.java
index 322b38da..98e9e895 100644
--- a/src/test/java/com/moabam/api/application/NotificationServiceTest.java
+++ b/src/test/java/com/moabam/api/application/NotificationServiceTest.java
@@ -108,6 +108,21 @@ void notificationService_sendCertificationTimeNotification(List<Participant> par
 		verify(firebaseMessaging, times(3)).sendAsync(any(Message.class));
 	}
 
+	@DisplayName("특정 인증 시간에 해당하는 방 사용자들의 토큰값이 없을 때, - Void")
+	@MethodSource("provideParticipants")
+	@ParameterizedTest
+	void notificationService_sendCertificationTimeNotification_NoFirebaseMessaging(List<Participant> participants) {
+		// Given
+		given(participantSearchRepository.findAllByRoomCertifyTime(any(Integer.class))).willReturn(participants);
+		given(notificationRepository.findFcmTokenByMemberId(any(Long.class))).willReturn(null);
+
+		// When
+		notificationService.sendCertificationTimeNotification();
+
+		// Then
+		verify(firebaseMessaging, times(0)).sendAsync(any(Message.class));
+	}
+
 	static Stream<Arguments> provideParticipants() {
 		Room room = RoomFixture.room(10);