diff --git a/database.py b/database.py
index 5b3eb2b..680835b 100644
--- a/database.py
+++ b/database.py
@@ -291,8 +291,8 @@ async def minus_user_points(conn: connection, user_id: str, bet_value: int):
         cur.execute(
             "UPDATE member "
             "SET points = points - %s "
-            "WHERE user_id=%s",
-            (bet_value, user_id)
+            "WHERE user_id = %s AND points - %s >= 50",
+            (bet_value, user_id, bet_value)
         )
 
         conn.commit()
diff --git a/database.sql b/database.sql
index f5d8435..aff685d 100644
--- a/database.sql
+++ b/database.sql
@@ -35,7 +35,7 @@ CREATE TABLE member
     user_id   VARCHAR(255),
     guild_id  VARCHAR(255),
     username  VARCHAR(255),
-    points    bigint DEFAULT 50 NOT NULL CHECK (points >= 50),
+    points    bigint DEFAULT 50,
     bet_value bigint DEFAULT 50,
     PRIMARY KEY (user_id),
     FOREIGN KEY (guild_id) REFERENCES guild (guild_id)