diff --git a/models/heartbeat.go b/models/heartbeat.go
index c9865c9..9016cec 100644
--- a/models/heartbeat.go
+++ b/models/heartbeat.go
@@ -32,7 +32,7 @@ type Heartbeat struct {
 	Hash            string     `json:"-" gorm:"type:varchar(17); uniqueIndex"`
 	Origin          string     `json:"-" hash:"ignore"`
 	OriginId        string     `json:"-" hash:"ignore"`
-	CreatedAt       CustomTime `json:"created_at" gorm:"type:timestamp" swaggertype:"primitive,number"` // https://gorm.io/docs/conventions.html#CreatedAt
+	CreatedAt       CustomTime `json:"created_at" gorm:"type:timestamp" swaggertype:"primitive,number" hash:"ignore"` // https://gorm.io/docs/conventions.html#CreatedAt
 }
 
 func (h *Heartbeat) Valid() bool {
diff --git a/services/heartbeat.go b/services/heartbeat.go
index faae574..e854b46 100644
--- a/services/heartbeat.go
+++ b/services/heartbeat.go
@@ -27,7 +27,18 @@ func (srv *HeartbeatService) Insert(heartbeat *models.Heartbeat) error {
 }
 
 func (srv *HeartbeatService) InsertBatch(heartbeats []*models.Heartbeat) error {
-	return srv.repository.InsertBatch(heartbeats)
+	hashes := make(map[string]bool)
+
+	// https://github.com/muety/wakapi/issues/139
+	filteredHeartbeats := make([]*models.Heartbeat, 0, len(heartbeats))
+	for _, hb := range heartbeats {
+		if _, ok := hashes[hb.Hash]; !ok {
+			filteredHeartbeats = append(filteredHeartbeats, hb)
+			hashes[hb.Hash] = true
+		}
+	}
+
+	return srv.repository.InsertBatch(filteredHeartbeats)
 }
 
 func (srv *HeartbeatService) Count() (int64, error) {
diff --git a/version.txt b/version.txt
index 6521720..7a429d6 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.24.5
+1.24.6