Runtime Error: Incomplete output while executing buy function for cs50 finance

While all the checks work, (empty symbol, invalid number of shares…), the function fails to actually purchase the stocks. It returns an internal server error. Following is the log output:

File “/usr/local/lib/python3.9/site-packages/cs50/sql.py”, line 71, in _execute raise RuntimeError(exc.orig) from None RuntimeError: incomplete input

Following is my buy function:

def buy():
    """Buy shares of stock"""
    if request.method == "POST":
        # access symbol and stock
        symbol = request.form.get("symbol")
        stock = lookup(symbol)

        # ensure valid symbol
        if not symbol:
            return apology("Please enter a valid symbol")
        elif not stock: #if symbol is invalid then none will get allocated to stock, which we dont want
            return apology("Invalid symbol")

        # access the number of shares and check for an integer
        try:
            shares = int(request.form.get("shares"))
        except:
            return apology("Shares must be an integer")

        # if shares are negative
        if shares <= 0:
            return apology("Shares must be a positive integer")


        user_id = session["user_id"]
        cash = db.execute("SELECT cash FROM users WHERE id = ?", user_id)[0]["cash"]

        stock_name = stock["name"]
        stock_price = stock["price"]
        total_price = stock_price * shares

        # check for sufficient funds
        if total_price > cash:
            return apology("Insufficient funds.")
        else:
            db.execute("UPDATE users SET cash = ? WHERE id = ?", cash - total_price, user_id)
            db.execute("INSERT INTO transactions (user_id, name, shares, price, type, symbol) VALUES ( ?, ?, ?, ?, ?, ?",
                        user_id, stock_name, shares, stock_price, 'buy', symbol)

        flash("Bought!")
        return redirect('/')

    else:
        return render_template("buy.html")

Following is my HTML code:

{% extends "layout.html" %}

{% block title %}
    buy
{% endblock %}

{% block main %}
    <form action="/buy" method="post">
        <div class="form-group">
            <input autocomplete="off" autofocus class="form-control" name="symbol" placeholder="symbol" type="text">
        </div>
        <div class="form-group">
            <input class="form-control" name="shares" placeholder="shares" type="text">
        </div>
        <button class="btn btn-primary" type="submit">Buy</button>
    </form>
{% endblock %}

Following is my SQL table:

field	type
id	INTEGER PRIMARY KEY AUTOINCREMENT,
user_id	INTEGER NOT NULL,
name	TEXT NOT NULL,
shares	INTEGER NOT NULL,
price	NUMERIC NOT NULL,
type	TEXT NOT NULL,
symbol	TEXT NOT NULL,
time	TIMESTAMP DEFAULT CURRENT_TIMESTAMP
FOREIGN KEY(user_id) REFERENCES users(id)

Answer

 db.execute("INSERT INTO transactions (user_id, name, shares, price, type, symbol) VALUES ( ?, ?, ?, ?, ?, ?", 
user_id, stock_name, shares, stock_price, 'buy', symbol)

Could it be that this statement needs to have a closing round bracket in VALUES?

 db.execute("INSERT INTO transactions (user_id, name, shares, price, type, symbol) VALUES ( ?, ?, ?, ?, ?, ?);", 
user_id, stock_name, shares, stock_price, 'buy', symbol)