diff --git a/be/app/Http/Resources/MasterTaskResource.php b/be/app/Http/Resources/MasterTaskResource.php
index 5b426e6..53ea379 100644
--- a/be/app/Http/Resources/MasterTaskResource.php
+++ b/be/app/Http/Resources/MasterTaskResource.php
@@ -24,7 +24,7 @@ class MasterTaskResource extends JsonResource
             'starts_at' => $this->created_at,
             'deadline' => $this->deadline,
             'project_code' => $this->project->code,
-            'team_id' => $this->team->id,
+            'team_id' => ($this->team) ? $this->team->id : null,
             'employees' => UserResource::collection($this->usersOutsideTeam),
             'subtasks' => SubTaskResource::collection($this->subtasks),
             'files' => AttachmentResource::collection($this->attachments),