diff --git a/common/models/ProjectTask.php b/common/models/ProjectTask.php
index 38867b1..fb4a13e 100644
--- a/common/models/ProjectTask.php
+++ b/common/models/ProjectTask.php
@@ -47,6 +47,9 @@ class ProjectTask extends ActiveRecord
     const PRIORITY_MEDIUM = 1;
     const PRIORITY_HIGH = 2;
 
+    const SCENARIO_UPDATE_TASK = 'update';
+
+
     const DAY_IN_UNIX_TIME = 86340; //  23:59:59
 
     /**
@@ -105,7 +108,7 @@ class ProjectTask extends ActiveRecord
     public function rules()
     {
         return [
-            [['project_id', 'status', 'title', 'description',], 'required'],
+            [['project_id', 'status', 'title', 'description',], 'required', 'on' => self::SCENARIO_DEFAULT],
             [['project_id', 'status', 'column_id', 'user_id', 'executor_id', 'priority', 'execution_priority'], 'integer'],
             [['created_at', 'updated_at', 'dead_line'], 'safe'],
             ['execution_priority', 'in', 'range' => [self::PRIORITY_LOW, self::PRIORITY_MEDIUM, self::PRIORITY_HIGH]],
diff --git a/frontend/modules/api/services/TaskService.php b/frontend/modules/api/services/TaskService.php
index 28af3e5..3d0b3e6 100644
--- a/frontend/modules/api/services/TaskService.php
+++ b/frontend/modules/api/services/TaskService.php
@@ -115,6 +115,7 @@ class TaskService
     public function updateTask($task_params): ?ProjectTask
     {
         $modelTask = ProjectTask::findOne($task_params['task_id']);
+        $modelTask->scenario = ProjectTask::SCENARIO_UPDATE_TASK;
 
         if (isset($task_params['executor_id']) && $task_params['executor_id'] == 0){
             $task_params['executor_id'] = null;