src/main/java/com/example/nto/controller/EmployeeController.java

@@ -23,8 +23,11 @@ public class EmployeeController {
     @Autowired
     private EmployeeService employeeService;
     @GetMapping("/{code}/auth")
-    public ResponseEntity<Void> checkAuth(
+    public  ResponseEntity<Void> checkAuth(
             @PathVariable String code)  {
+        if (code==null){
+            throw new IllegalArgumentException("Employee code is required");
+        }
         try {
             employeeService.getEmployeeByCode(code);
             return ResponseEntity.ok().build();