diff --git a/core.go b/core.go
index e14dcc5..397681c 100644
--- a/core.go
+++ b/core.go
@@ -129,11 +129,12 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 
 	tfdate := t.Format("2006-01-02 15:04:05")
 
-	tmp, _ := json.Marshal(ta.TimesOnDay)
+	var err error
+	tmp, err := json.Marshal(ta.TimesOnDay)
 	mainKey := fmt.Sprintf("[%s][%s]", tfdate, string(tmp))
 
 	value, ok := isInTimeOfDayCacheBool.Load(mainKey)
-	if ok {
+	if ok && err == nil {
 		ret := value.(int)
 		if ret == 3 {
 			return true
@@ -144,7 +145,6 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 	}
 
 	parseInLocationCache := map[string]time.Time{}
-	var err error
 	for k := range ta.TimesOnDay {
 		tsp := strings.Split(ta.TimesOnDay[k], "-")
 		if len(tsp) < 2 {