| @@ -404,7 +404,7 @@ class LensmanInfo(BaseModelMixin): | ||
| 404 | 404 | def is_expired(self): | 
| 405 | 405 | now_time = datetime.datetime.now() | 
| 406 | 406 | now_date = datetime.date(now_time.year, now_time.month, now_time.day) | 
| 407 | - return not (self.start_date <= now_date <= self.end_date) | |
| 407 | + return not self.start_date <= now_date <= self.end_date if self.start_date and self.end_date else False | |
| 408 | 408 |  | 
| 409 | 409 | @property | 
| 410 | 410 | def data(self): |