diff --git a/kraken-app/kraken-app-portal/src/pages/HomePage/components/ActivityDiagrams/index.tsx b/kraken-app/kraken-app-portal/src/pages/HomePage/components/ActivityDiagrams/index.tsx
index 6cc0bf35..f62750dc 100644
--- a/kraken-app/kraken-app-portal/src/pages/HomePage/components/ActivityDiagrams/index.tsx
+++ b/kraken-app/kraken-app-portal/src/pages/HomePage/components/ActivityDiagrams/index.tsx
@@ -110,7 +110,7 @@ const ActivityDiagrams = ({ envs }: Props) => {
             </Form.Item>
             <Form.Item name="buyer">
               <Select
-                options={[{ value: "all", label: "All buyers" }]}
+                options={[{ value: undefined, label: "All buyers" }]}
                 placeholder="All buyers"
                 popupMatchSelectWidth={false}
                 size="middle"
diff --git a/kraken-app/kraken-app-portal/src/utils/constants/format.ts b/kraken-app/kraken-app-portal/src/utils/constants/format.ts
index e48c1c19..cca675a2 100644
--- a/kraken-app/kraken-app-portal/src/utils/constants/format.ts
+++ b/kraken-app/kraken-app-portal/src/utils/constants/format.ts
@@ -31,4 +31,4 @@ export const recentXDays = (value?: number) => {
 export const parseDateStartOrEnd = (date: string | undefined, type: "start" | "end") =>
   date
     ? dayjs(date)[type === "start" ? "startOf" : "endOf"]("day").format(TIME_ZONE_FORMAT)
-    : getCurrentTimeWithZone();
\ No newline at end of file
+    : null;
\ No newline at end of file