diff --git a/engine/simple_serializer.go b/engine/simple_serializer.go
index 5ebe16ae5..ff11ec3a6 100644
--- a/engine/simple_serializer.go
+++ b/engine/simple_serializer.go
@@ -581,8 +581,11 @@ func (mb *MinuteBucket) Store() (result string, err error) {
 
 func (mb *MinuteBucket) Restore(input string) error {
 	input = strings.TrimSpace(input)
+	if len(input) == 0 {
+		return nil
+	}
 	elements := strings.Split(input, ";")
-	if len(input) > 0 && len(elements) != 5 {
+	if len(elements) != 5 {
 		return notEnoughElements("MinuteBucket", input)
 	}
 	mb.Seconds, _ = strconv.ParseFloat(elements[0], 64)