Whenever I execute the command. I get an error:

UnhandledPromiseRejectionWarning: SqliteError: database disk image is malformed

Here is the full code:

const db = require("quick.db");

module.exports = {
  name: "setprefix",
  description: "Set a server's prefix",

  async run(client, message, args) {
    if (!message.member.hasPermission("MANAGE_MESSAGES"))
      return message.channel.send("You don't have permission to use that.");

    if (!args[0]) return message.channel.send("Please provide a new prefix");

    if (args[1])
      return message.channel.send("The prefix can't have two spaces");

    db.set(`prefix_${message.guild.id}`, args[0]);

    message.channel.send(`Successfully set new prefix to **${args[0]}**`);
  }
};

When I leave it blank it does say "please provide a prefix" but an error occurs when I do enter a prefix. How do I fix this?