diff --git a/app/modules/Profiler/Interfaces/Http/Controllers/ShowFlameChartAction.php b/app/modules/Profiler/Interfaces/Http/Controllers/ShowFlameChartAction.php
index deeaa2de..917d1a3f 100644
--- a/app/modules/Profiler/Interfaces/Http/Controllers/ShowFlameChartAction.php
+++ b/app/modules/Profiler/Interfaces/Http/Controllers/ShowFlameChartAction.php
@@ -14,10 +14,10 @@
 final readonly class ShowFlameChartAction
 {
     #[Route(route: 'profiler/<uuid>/flame-chart', name: 'profiler.show.flame-chart', methods: ['GET'], group: 'api')]
-    public function __invoke(QueryBusInterface $bus, Uuid $uuid): array
+    public function __invoke(QueryBusInterface $bus, Uuid $uuid): string
     {
         try {
-            /** @var array $flameChart */
+            /** @var string $flameChart */
             $flameChart = $bus->ask(new FindFlameChartByUuid($uuid));
         } catch (EntityNotFoundException $e) {
             throw new NotFoundException($e->getMessage());
diff --git a/app/modules/Profiler/Interfaces/Queries/FindFlameChartByUuidHandler.php b/app/modules/Profiler/Interfaces/Queries/FindFlameChartByUuidHandler.php
index 5d1bd2ae..f67a6e7a 100644
--- a/app/modules/Profiler/Interfaces/Queries/FindFlameChartByUuidHandler.php
+++ b/app/modules/Profiler/Interfaces/Queries/FindFlameChartByUuidHandler.php
@@ -20,11 +20,11 @@ public function __construct(
     ) {}
 
     #[QueryHandler]
-    public function __invoke(FindFlameChartByUuid $query): array
+    public function __invoke(FindFlameChartByUuid $query): string
     {
         $file = $query->profileUuid . '.flamechart.json';
         if ($this->bucket->exists($file)) {
-            return \json_decode($this->bucket->getContents($file), true);
+            return $this->bucket->getContents($file);
         }
 
         $profile = $this->orm->getRepository(Profile::class)->findByPK($query->profileUuid);
@@ -67,9 +67,10 @@ public function __invoke(FindFlameChartByUuid $query): array
         }
 
         $this->adjustStartTimes($waterfall, 0);
-        $this->bucket->write($file, \json_encode($waterfall, 0, 5000));
+        $serialized = \json_encode($waterfall, 0, 5000);
+        $this->bucket->write($file, $serialized);
 
-        return $waterfall;
+        return $serialized;
     }
 
     private function adjustStartTimes(array &$eventList, float|int $startTime): void