diff --git a/webserver/src/main/java/io/kestra/webserver/controllers/api/DashboardController.java b/webserver/src/main/java/io/kestra/webserver/controllers/api/DashboardController.java
index 75bc0ea3ea0..1bfc2283922 100644
--- a/webserver/src/main/java/io/kestra/webserver/controllers/api/DashboardController.java
+++ b/webserver/src/main/java/io/kestra/webserver/controllers/api/DashboardController.java
@@ -157,22 +157,23 @@ public PagedResults<Map<String, Object>> dashboardChart(
         @Parameter(description = "The chart id") @PathVariable String chartId,
         @Parameter(description = "The filters to apply, some can override chart definition like labels & namespace") @Body GlobalFilter globalFilter
     ) throws IOException {
-        ZonedDateTime startDate = globalFilter.getStartDate();
+        String tenantId = tenantService.resolveTenant();
+        Dashboard dashboard = dashboardRepository.get(tenantId, id).orElse(null);
+        if (dashboard == null) {
+            return null;
+        }
+
         ZonedDateTime endDate = globalFilter.getEndDate();
+        ZonedDateTime startDate = globalFilter.getStartDate();
         if (startDate == null || endDate == null) {
-            throw new IllegalArgumentException("`startDate` and `endDate` filters are required.");
+            endDate = ZonedDateTime.now();
+            startDate = endDate.minus(dashboard.getTimeWindow().getDefaultDuration());
         }
 
         if (endDate.isBefore(startDate)) {
             throw new IllegalArgumentException("`endDate` must be after `startDate`.");
         }
 
-        String tenantId = tenantService.resolveTenant();
-        Dashboard dashboard = dashboardRepository.get(tenantId, id).orElse(null);
-        if (dashboard == null) {
-            return null;
-        }
-
         Duration windowDuration = Duration.ofSeconds(endDate.minus(Duration.ofSeconds(startDate.toEpochSecond())).toEpochSecond());
         if (windowDuration.compareTo(dashboard.getTimeWindow().getMax()) > 0) {
             throw new IllegalArgumentException("The queried window is larger than the max allowed one.");