Fix #10988

app/Api/V1/Requests/Data/DateRequest.php

@@ -46,6 +46,16 @@ class DateRequest extends FormRequest
     {
         $start = $this->getCarbonDate('start');
         $end   = $this->getCarbonDate('end');
+        if(null === $start) {
+            $start = now()->startOfMonth();
+        }
+        if(null === $end) {
+            $end = now()->endOfMonth();
+        }
+        // sanity check on dates:
+        [$start, $end]             = $end < $start ? [$end, $start] : [$start, $end];
+
+
         $start->startOfDay();
         $end->endOfDay();
         if ($start->diffInYears($end, true) > 5) {

changelog.md

@@ -25,6 +25,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - [Issue 10956](https://github.com/firefly-iii/firefly-iii/issues/10956) (Manual webhook trigger fail) reported by @dudu7731
 - [Issue 10960](https://github.com/firefly-iii/firefly-iii/issues/10960) (404 after deleting subscription) reported by @lindely
 - [Discussion 10974](https://github.com/orgs/firefly-iii/discussions/10974) (Big webhook_messages table) started by @Billos
+- #10988
 - [Issue 10990](https://github.com/firefly-iii/firefly-iii/issues/10990) (duplicate piggy event via API) reported by @4e868df3
 
 ### API