diff --git a/shvatka/core/models/dto/action/keys.py b/shvatka/core/models/dto/action/keys.py
index 79164231..aeb3f545 100644
--- a/shvatka/core/models/dto/action/keys.py
+++ b/shvatka/core/models/dto/action/keys.py
@@ -3,6 +3,7 @@
 from typing import Literal
 
 from shvatka.core.models import enums
+from shvatka.core.utils.input_validation import is_key_valid
 from . import StateHolder
 from .decisions import NotImplementedActionDecision
 from .interface import (
@@ -23,6 +24,12 @@ class BonusKey:
     text: SHKey
     bonus_minutes: float
 
+    def __post_init__(self):
+        if not is_key_valid(self.text):
+            raise ValueError
+        if not (-600 < self.bonus_minutes < 60):
+            raise ValueError("bonus out of available range")
+
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, BonusKey):
             return NotImplemented
diff --git a/shvatka/tgbot/dialogs/level_scn/handlers.py b/shvatka/tgbot/dialogs/level_scn/handlers.py
index 5ad890f5..2ca1650b 100644
--- a/shvatka/tgbot/dialogs/level_scn/handlers.py
+++ b/shvatka/tgbot/dialogs/level_scn/handlers.py
@@ -13,7 +13,6 @@
     is_multiple_keys_normal,
     normalize_key,
     validate_level_id,
-    is_key_valid,
 )
 from shvatka.infrastructure.db.dao.holder import HolderDao
 from shvatka.tgbot import states
@@ -70,17 +69,12 @@ async def on_correct_keys(m: Message, dialog_: Any, manager: DialogManager, keys
     await manager.done({"keys": keys})
 
 
-def convert_bonus_keys(text: str) -> list[shvatka.core.models.dto.action.keys.BonusKey]:
+def convert_bonus_keys(text: str) -> list[action.BonusKey]:
     result = []
     for key_str in text.splitlines():
         key, bonus = key_str.split(maxsplit=1)
-        if not is_key_valid(key):
-            raise ValueError
-        parsed_bonus = float(bonus)
-        if not (-600 < parsed_bonus < 60):
-            raise ValueError("bonus out of available range")
-        parsed_key = shvatka.core.models.dto.action.keys.BonusKey(
-            text=key, bonus_minutes=parsed_bonus
+        parsed_key = action.BonusKey(
+            text=key, bonus_minutes=float(bonus)
         )
         result.append(parsed_key)
     return result