1 files changed, 3 insertions, 3 deletions
diff --git a/src/match_up/controller.py b/src/match_up/controller.py
index 2f8bfaf..6188b3e 100644
--- a/src/match_up/controller.py
+++ b/src/match_up/controller.py
@@ -1,6 +1,6 @@
 from typing import Tuple
 from operator import attrgetter
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from match_up.utilities import sample_list, Timer
 from match_up.model import Team, Game, PlayerList, CourtList, MAX_LEVEL, PLAYER_PER_COURT
 
@@ -43,8 +43,8 @@ def _create_games(courts: dict, players: list[dict], levels: int):
 
 @dataclass
 class RoundGenerator:
-    courts: CourtList
-    players: PlayerList
+    courts: CourtList = field(default_factory=lambda: CourtList())
+    players: PlayerList = field(default_factory=lambda: PlayerList())
     round: int = 0
     proposal: tuple = tuple()