diff --git a/src/stores/mixin.ts b/src/stores/mixin.ts
index 86f9cf771..1150d670f 100644
--- a/src/stores/mixin.ts
+++ b/src/stores/mixin.ts
@@ -77,7 +77,8 @@ export const useCounterMixin = defineStore("mixin", () => {
     isFullMonth: boolean = false,
     isTime: boolean = false
   ) {
-    if (srcDate == null) return null;
+    if (srcDate == null || !moment(srcDate).isValid()) return "";
+
     const dateMoment = moment(srcDate);
     const day = dateMoment.format("DD");
     const month = dateMoment.format(isFullMonth ? "MMMM" : "MMM");