diff --git a/src/history_logger.go b/src/history_logger.go
index 928390f..f4e5fc2 100644
--- a/src/history_logger.go
+++ b/src/history_logger.go
@@ -12,6 +12,7 @@ type JobHistoryLogger struct {
 	jobStatus  JobStatus
 	resources  []NodeStatus
 	killedFlag bool
+	mu         sync.Mutex
 }
 
 var jobHistoryLoggerInstance *JobHistoryLogger
@@ -35,12 +36,16 @@ func (jhl *JobHistoryLogger) init() {
 }
 
 func (jhl *JobHistoryLogger) submitJob(job Job) {
+	jhl.mu.Lock()
+	defer jhl.mu.Unlock()
 	log.Debug("submit job", job.Name)
 	jhl.jobs[job.Name] = job
 	jhl.tasks[job.Name] = []TaskStatus{}
 }
 
 func (jhl *JobHistoryLogger) updateJobStatus(jobName string, state State) {
+	jhl.mu.Lock()
+	defer jhl.mu.Unlock()
 	log.Debug("update job status", jobName)
 	if job, ok := jhl.jobs[jobName]; ok {
 		job.Status = state
@@ -48,6 +53,8 @@ func (jhl *JobHistoryLogger) updateJobStatus(jobName string, state State) {
 }
 
 func (jhl *JobHistoryLogger) submitTaskStatus(jobName string, task TaskStatus) {
+	jhl.mu.Lock()
+	defer jhl.mu.Unlock()
 	log.Debug("submit job task status", jobName)
 	if tasks, ok := jhl.tasks[jobName]; ok {
 		jhl.tasks[jobName] = append(tasks, task)
@@ -55,6 +62,8 @@ func (jhl *JobHistoryLogger) submitTaskStatus(jobName string, task TaskStatus) {
 }
 
 func (jhl *JobHistoryLogger) getTaskStatus(jobName string) []TaskStatus {
+	jhl.mu.Lock()
+	defer jhl.mu.Unlock()
 	if _, ok := jhl.tasks[jobName]; ok {
 		return jhl.tasks[jobName]
 	}