lib/data/dao/group_game_dao.dart

@@ -42,6 +42,6 @@ class GroupGameDao extends DatabaseAccessor<AppDatabase>
   Future<void> addGroupToGame(String gameId, String groupId) async {
     await into(
       groupGameTable,
-    ).insert(GroupGameTableCompanion.insert(groupId: groupId, gameId: gameId));
+    ).insert(GroupGameTableCompanion.insert(groupId: groupId, gameId: gameId), mode:  InsertMode.insertOrReplace);
   }
 }

lib/data/dao/player_game_dao.dart

@@ -46,6 +46,7 @@ class PlayerGameDao extends DatabaseAccessor<AppDatabase>
   }) async {
     await into(playerGameTable).insert(
       PlayerGameTableCompanion.insert(playerId: playerId, gameId: gameId),
+      mode: InsertMode.insertOrReplace,
     );
   }
 }