diff --git a/pkg/models/tasks.go b/pkg/models/tasks.go
index 97e8dcc39..f2471b1ac 100644
--- a/pkg/models/tasks.go
+++ b/pkg/models/tasks.go
@@ -1517,14 +1517,20 @@ func updateRelativeReminderDates(task *Task) (err error) {
 		case ReminderRelationDueDate:
 			if !task.DueDate.IsZero() {
 				reminder.Reminder = task.DueDate.Add(relativeDuration)
+			} else {
+				reminder.Reminder = time.Time{}
 			}
 		case ReminderRelationStartDate:
 			if !task.StartDate.IsZero() {
 				reminder.Reminder = task.StartDate.Add(relativeDuration)
+			} else {
+				reminder.Reminder = time.Time{}
 			}
 		case ReminderRelationEndDate:
 			if !task.EndDate.IsZero() {
 				reminder.Reminder = task.EndDate.Add(relativeDuration)
+			} else {
+				reminder.Reminder = time.Time{}
 			}
 		default:
 			if reminder.RelativePeriod != 0 {