diff --git a/src/Http/Controllers/StatController.php b/src/Http/Controllers/StatController.php
index 3edc750..c649b2a 100644
--- a/src/Http/Controllers/StatController.php
+++ b/src/Http/Controllers/StatController.php
@@ -22,8 +22,12 @@ public function widgetData(DataRequest $request)
             case 'period_total':
                 return $modelStats->getPeriodTotal($dateFrom, $dateTo, $request->date_column);
             case 'group_by_count':
-                return $modelStats->getGroupByCount($dateFrom, $dateTo, $request->date_column,
-                    $request->aggregate_column);
+                return $modelStats->getGroupByCount(
+                    $dateFrom,
+                    $dateTo,
+                    $request->date_column,
+                    $request->aggregate_column
+                );
             default:
                 throw new \Exception('Wigdet aggregate type not supported.');
         }
diff --git a/src/Http/Requests/Widgets/DataRequest.php b/src/Http/Requests/Widgets/DataRequest.php
index 1f3397e..c895c0c 100644
--- a/src/Http/Requests/Widgets/DataRequest.php
+++ b/src/Http/Requests/Widgets/DataRequest.php
@@ -16,11 +16,11 @@ class DataRequest extends FormRequest
         'daily_count',
         'cumulated_daily_count',
         'period_total',
-        'group_by_count'
+        'group_by_count',
     ];
 
     const AGGREGATES_TYPES_WITH_AGGREGATE_COLUMN = [
-        'group_by_count'
+        'group_by_count',
     ];
 
     /**
@@ -36,7 +36,7 @@ public function rules()
             'date_column' => 'required',
             'date_from' => 'required|date_format:Y-m-d|before:date_to',
             'date_to' => 'required|date_format:Y-m-d|after:date_from',
-            'aggregate_column' => [Rule::requiredIf( in_array(request()->aggregate_type, self::AGGREGATES_TYPES_WITH_AGGREGATE_COLUMN))],
+            'aggregate_column' => [Rule::requiredIf(in_array(request()->aggregate_type, self::AGGREGATES_TYPES_WITH_AGGREGATE_COLUMN))],
         ];
     }
 
diff --git a/src/Services/ModelStats.php b/src/Services/ModelStats.php
index 33b3c2b..3f4f3ba 100644
--- a/src/Services/ModelStats.php
+++ b/src/Services/ModelStats.php
@@ -106,11 +106,11 @@ public static function fillMissingDays($data, Carbon $since, Carbon $to, $defaul
 
         foreach (array_reverse(range(0, $daysSince)) as $number) {
             $dateKey = $to->copy()->subDays($number)->format('Y-m-d');
-            if (!isset($data[$dateKey])) {
+            if (! isset($data[$dateKey])) {
                 $data[$dateKey] = $defaultValue;
             }
 
-            if (!is_null($cumulatedSum)) {
+            if (! is_null($cumulatedSum)) {
                 $data[$dateKey] += $cumulatedSum;
                 $cumulatedSum = $data[$dateKey];
             }