fix: FIT-1439: FSM State Manager must not attempt to transition state with Anonymous users it should be None

label_studio/fsm/state_manager.py

@@ -355,7 +355,7 @@ def transition_state(
                     state=new_state,
                     previous_state=current_state,
                     transition_name=transition_name,
-                    triggered_by=user,
+                    triggered_by=user if getattr(user, 'is_authenticated', False) else None,
                     context_data=context or {},
                     reason=reason,
                     organization_id=organization_id,

label_studio/fsm/tests/test_fsm_integration.py

@@ -424,3 +424,26 @@ def test_same_state_transition_prevention(self, mock_flag_set):
         # Verify state is still CREATED
         current_state = self.StateManager.get_current_state_value(self.task)
         assert current_state == 'CREATED'
+
+    @patch('fsm.state_manager.flag_set')
+    def test_transition_with_anonymous_user(self, mock_flag_set):
+        """Test that transitioning state with AnonymousUser succeeds and sets triggered_by to None."""
+        from django.contrib.auth.models import AnonymousUser
+        from django.core.cache import cache
+
+        cache.clear()
+
+        mock_flag_set.return_value = True
+
+        anon_user = AnonymousUser()
+        success = self.StateManager.transition_state(
+            entity=self.task,
+            new_state='IN_PROGRESS',
+            user=anon_user,
+            transition_name='start_task_anon',
+        )
+        assert success
+
+        current_state_obj = self.StateManager.get_current_state_object(self.task)
+        assert current_state_obj.state == 'IN_PROGRESS'
+        assert current_state_obj.triggered_by is None