app/Http/Controllers/Api/CalculatorController.php

@@ -50,6 +50,7 @@ class CalculatorController extends Controller
                         ->filter(fn($optionalSubject) => in_array($optionalSubject, $calcultatorSubjects));
                     return $optionalSubjectsInCalculator->count() !== 0;
                 }
+                return true;
             })->map(fn($subjectTypes, $directionId) => $directionId);
 
         $directions = Direction::whereIn('id', $result)->get();