diff --git a/internal/chore/handler.go b/internal/chore/handler.go
index 9667385..4000d84 100644
--- a/internal/chore/handler.go
+++ b/internal/chore/handler.go
@@ -231,7 +231,13 @@ func (h *Handler) createChore(c *gin.Context) {
 		return
 	}
 	stringNotificationMetadata := string(notificationMetadataBytes)
-
+	if stringNotificationMetadata == "null" {
+		// TODO: Clean this update after 0.1.38.. there is a bug in the frontend that sends null instead of empty object
+		// this is a temporary fix to avoid breaking changes
+		// once change we can change notificationMetadataBytes to     var notificationMetadataMap map[string]interface{} to gernerate empty object
+		// and remove this check
+		stringNotificationMetadata = "{}"
+	}
 	var stringLabels *string
 	if len(choreReq.Labels) > 0 {
 		var escapedLabels []string
@@ -243,6 +249,7 @@ func (h *Handler) createChore(c *gin.Context) {
 		stringLabels = &labels
 	}
 	createdChore := &chModel.Chore{
+
 		Name:                 choreReq.Name,
 		FrequencyType:        choreReq.FrequencyType,
 		Frequency:            choreReq.Frequency,
@@ -263,7 +270,6 @@ func (h *Handler) createChore(c *gin.Context) {
 		CompletionWindow:     choreReq.CompletionWindow,
 		Description:          choreReq.Description,
 		SubTasks:             choreReq.SubTasks,
-		Priority:             choreReq.Priority,
 	}
 	id, err := h.choreRepo.CreateChore(c, createdChore)
 	createdChore.ID = id
@@ -464,6 +470,13 @@ func (h *Handler) editChore(c *gin.Context) {
 		return
 	}
 	stringNotificationMetadata := string(notificationMetadataBytes)
+	if stringNotificationMetadata == "null" {
+		// TODO: Clean this update after 0.1.38.. there is a bug in the frontend that sends null instead of empty object
+		// this is a temporary fix to avoid breaking changes
+		// once change we can change notificationMetadataBytes to     var notificationMetadataMap map[string]interface{} to gernerate empty object
+		// and remove this check
+		stringNotificationMetadata = "{}"
+	}
 
 	// escape special characters in labels and store them as a string :
 	var stringLabels *string
@@ -547,7 +560,6 @@ func (h *Handler) editChore(c *gin.Context) {
 		if choreReq.SubTasks == nil {
 			choreReq.SubTasks = &[]stModel.SubTask{}
 		}
-		// check what subtask needed to be removed:
 		for _, existedSubTask := range *oldChore.SubTasks {
 			found := false
 			for _, newSubTask := range *choreReq.SubTasks {
@@ -560,16 +572,14 @@ func (h *Handler) editChore(c *gin.Context) {
 				ToBeRemoved = append(ToBeRemoved, existedSubTask)
 			}
 		}
-		// check what subtask needed to be added or updated:
+
 		for _, newSubTask := range *choreReq.SubTasks {
 			found := false
 			newSubTask.ChoreID = oldChore.ID
 
 			for _, existedSubTask := range *oldChore.SubTasks {
 				if existedSubTask.ID == newSubTask.ID {
-					if existedSubTask.Name != newSubTask.Name ||
-						existedSubTask.OrderID != newSubTask.OrderID ||
-						existedSubTask.ParentId != newSubTask.ParentId {
+					if existedSubTask.Name != newSubTask.Name || existedSubTask.OrderID != newSubTask.OrderID {
 						// there is a change in the subtask, update it
 						break
 					}
diff --git a/migrations/20250314_fix_notification_metadata_experiment_modal.go b/migrations/20250314_fix_notification_metadata_experiment_modal.go
new file mode 100644
index 0000000..9226494
--- /dev/null
+++ b/migrations/20250314_fix_notification_metadata_experiment_modal.go
@@ -0,0 +1,43 @@
+package migrations
+
+import (
+	"context"
+
+	"donetick.com/core/logging"
+	"gorm.io/gorm"
+)
+
+type MigrateFixNotificationMetadataExperimentModal20241212 struct{}
+
+func (m MigrateFixNotificationMetadataExperimentModal20241212) ID() string {
+	return "20250314_fix_notification_metadata_experiment_modal"
+}
+
+func (m MigrateFixNotificationMetadataExperimentModal20241212) Description() string {
+	return `Fix notification metadata for experiment modal, where notification metadata is a null string 'null' to empty json {}`
+}
+
+func (m MigrateFixNotificationMetadataExperimentModal20241212) Down(ctx context.Context, db *gorm.DB) error {
+	return nil
+}
+
+func (m MigrateFixNotificationMetadataExperimentModal20241212) Up(ctx context.Context, db *gorm.DB) error {
+	log := logging.FromContext(ctx)
+
+	// Start a transaction
+	return db.Transaction(func(tx *gorm.DB) error {
+		// Update all chore where notification metadata is a null stirng 'null' to empty json {}:
+
+		if err := tx.Table("chores").Where("notification_metadata = ?", "null").Update("notification_metadata", "{}").Error; err != nil {
+			log.Errorf("Failed to update chores with null notification metadata: %v", err)
+			return err
+		}
+
+		return nil
+	})
+}
+
+// Register this migration
+func init() {
+	Register(MigrateFixNotificationMetadataExperimentModal20241212{})
+}