diff --git a/internal/auth/auth.util.go b/internal/auth/auth.util.go
index ddada75..91011ce 100644
--- a/internal/auth/auth.util.go
+++ b/internal/auth/auth.util.go
@@ -38,6 +38,9 @@ func ConvertRegisterRequestDTOToUser(dto *dto.RegisterRequestDTO, email string)
 
 func DesiredRoundDTOToModel(dto *dto.DesiredRound, userId int) model.DesiredRound {
 	var desiredRound model.DesiredRound
+	if dto == nil {
+		return desiredRound
+	}
 	desiredRound.Order = dto.Order
 	desiredRound.Round = model.Round(dto.Round)
 	desiredRound.UserId = uint(userId)
@@ -88,6 +91,9 @@ func UserModelToUserDTO(mUser *model.User) dto.User {
 
 func InterestedFacultyToFacultyInfo(m *model.InterestedFaculty) dto.FacultyInfo {
 	var facultyInfo dto.FacultyInfo
+	if m == nil {
+		return facultyInfo
+	}
 	facultyInfo.Department.Code = m.DepartmentCode
 	facultyInfo.Department.Name.En = m.Department.Name.En
 	facultyInfo.Department.Name.Th = m.Department.Name.Th
@@ -102,6 +108,9 @@ func InterestedFacultyToFacultyInfo(m *model.InterestedFaculty) dto.FacultyInfo
 
 func DesiredRoundModelToDTO(m *model.DesiredRound) dto.DesiredRound {
 	var desiredRound dto.DesiredRound
+	if m == nil {
+		return desiredRound
+	}
 	desiredRound.Order = m.Order
 	desiredRound.Round = string(m.Round)
 	return desiredRound
@@ -109,6 +118,9 @@ func DesiredRoundModelToDTO(m *model.DesiredRound) dto.DesiredRound {
 
 func ScheduleModelToDTO(m *model.Schedule) dto.Schedule {
 	var registeredEvent dto.Schedule
+	if m == nil {
+		return registeredEvent
+	}
 	registeredEvent.Id = m.Id
 	registeredEvent.CurrentAttendee = m.CurrentAttendee
 	registeredEvent.StartsAt = m.StartsAt
diff --git a/internal/dto/bilingual_field.dto.go b/internal/dto/bilingual_field.dto.go
index 1c9087c..eb6a9e8 100644
--- a/internal/dto/bilingual_field.dto.go
+++ b/internal/dto/bilingual_field.dto.go
@@ -9,6 +9,9 @@ type BilingualField struct {
 
 func BilingualModelToDTO(m *model.Bilingual) BilingualField {
 	var bf BilingualField
+	if m == nil {
+		return bf
+	}
 	bf.En = m.En
 	bf.Th = m.Th
 	return bf
diff --git a/internal/event/event.utils.go b/internal/event/event.utils.go
index 23d1e6b..3082257 100644
--- a/internal/event/event.utils.go
+++ b/internal/event/event.utils.go
@@ -7,6 +7,9 @@ import (
 
 func EventModelToDTO(m *model.Event) dto.Event {
 	var event dto.Event
+	if m == nil {
+		return event
+	}
 	event.Id = m.Id
 	event.Name = dto.BilingualModelToDTO(&m.Name)
 	event.Faculty.Code = m.FacultyCode
@@ -26,6 +29,9 @@ func EventModelToDTO(m *model.Event) dto.Event {
 
 func ScheduleModelToDTO(m *model.Schedule) dto.Schedule {
 	var schedule dto.Schedule
+	if m == nil {
+		return schedule
+	}
 	schedule.Id = m.Id
 	schedule.EndsAt = m.EndsAt
 	schedule.StartsAt = m.StartsAt